Brickonomics | Cat Birthday Party & Tree House (42666-1)

Cat Birthday Party & Tree House (42666-1)

LEGO set 42666-1 Cat Birthday Party & Tree House - Image 1

Price Comparison

No retailers currently stock Cat Birthday Party & Tree House in The United States.

Set details

Name: Cat Birthday Party & Tree House
Set number: 42666-1
Year: 2025
Theme: Friends
Number of parts: 321
Number of part types: 138
Age rating: 6+
Retail price: $29.99
Retirement date: 31-12-2026

Discover a paw-some building kit for girls, boys and cat-lovers aged 6 and up. The LEGO® Friends Cat Birthday Party & Tree House (42666) toy comes with 2 minidolls, 5 cat figures and lots of accessories for imaginative play packed with sweet kitty moments. This fun toy sets the scene for Churro’s birthday party. 4 of Churro’s feline friends are here too, plus LEGO Friends characters Leo and Paisley. Explore the fun details, including birthday presents, banners and cat-shaped balloons. Kids will love guiding the pets around the cat tree house, where there’s a fish-shaped piñata, a cat toy, cat grass, a water fountain and litter box. Then it’s time for the cats to sit at the rotating table to enjoy Churro’s birthday cake. With so many ways to play with this animal playset, kids can tell a different friendship story every time. Discover more exciting creative toys (sold separately) in the LEGO Friends universe. This LEGO set comes with the LEGO Builder app for intuitive building.

Price History

Track how the lowest available price for set 42666-1 in The United States has changed over time.

Browse all 321 parts in set 42666-1 with individual pricing from BrickLink or Brick Owl.

Price source:

Value of parts: $65.67
Pricing information known of 136/138 parts.

Part

Color

Quantity

Average price

Total

Value

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end

Tan

$0.88

$5.27

6 x $0.88

$5.27

String with End Studs 11L Overall

Black

$1.27

$2.54

2 x $1.27

$2.54

Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small

Bright Green

$0.50

$2.50

5 x $0.50

$2.50

Plant, Plate 1 x 1 Round with 3 Leaves

Yellowish Green

$0.09

$2.37

25 x $0.09

$2.37

Animal, Cat, Sitting with Dark Brown Stripes, White Chest, Ears print

Medium Brown

$1.99

$1.99

1 x $1.99

$1.99

Animal, Cat, Chubby with orange Face, Toes, Medium Blue/Lime Eyes print

White

$1.95

$1.95

1 x $1.95

$1.95

Animal, Cat, Chubby with Bright Green Eyes, Light Bluish Grey Fur print

Dark Bluish Gray

$1.87

$1.87

1 x $1.87

$1.87

Animal, Cat, Kitten Sitting with Open Eyes, White Mouth, Nougat Paws print

Nougat

$1.74

$1.74

1 x $1.74

$1.74

Plant, Flower with 5 Pointed Petals and Pin

Light Aqua

$0.54

$1.62

3 x $0.54

$1.62

Animal, Cat, Kitten Sitting with Yellow Eyes, Dark Pink Tongue print

Black

$1.54

$1.54

1 x $1.54

$1.54

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Bright Pink

$0.50

$1.50

3 x $0.50

$1.50

Plate Round Corner 6 x 6

Blue

$0.74

$1.49

2 x $0.74

$1.49

Wool / Yarn

Bright Light Yellow

$1.38

$1.38

1 x $1.38

$1.38

Brick 2 x 3

Dark Orange

$1.18

$1.18

1 x $1.18

$1.18

Plate 1 x 10

Medium Azure

$0.39

$1.18

3 x $0.39

$1.18

Container Box 2 x 2 x 1 Reinforced Bottom

Bright Pink

$0.39

$1.18

3 x $0.39

$1.18

Headwear Accessory Hat with Small Pin, Cap

Lime

$0.50

$1.00

2 x $0.50

$1.00

Plate Special 1 x 2 Rounded with 2 Open Studs

Bright Green

$0.49

$0.97

2 x $0.49

$0.97

Plant, Stem with 3 Leaves and Bottom Pin

Bright Green

$0.14

$0.95

7 x $0.14

$0.95

Plate 6 x 10

Lime

$0.46

$0.92

2 x $0.46

$0.92

Equipment Candlestick

Reddish Brown

$0.15

$0.89

6 x $0.15

$0.89

Technic Axle Connector Smooth [with x Hole + Orientation]

Tan

$0.15

$0.89

6 x $0.15

$0.89

Plant, Leaves Stacked 4 x 5 x 1 2/3

Lime

$0.30

$0.89

3 x $0.30

$0.89

Plant, Leaves 4 x 3

Lime

$0.11

$0.87

8 x $0.11

$0.87

Brick Special 1 x 1 with Studs on 2 Sides

Blue

$0.81

$0.81

1 x $0.81

$0.81

Tile 1 x 2 with Cat Food Box, Cat, White 'MEOW BITS' print

Light Aqua

$0.38

$0.76

2 x $0.38

$0.76

Plate Round 1 x 2 Half Circle with Stud (Jumper)

Blue

$0.74

$0.74

1 x $0.74

$0.74

Tile Round 1 x 2 Half Circle

Medium Azure

$0.24

$0.73

3 x $0.24

$0.73

Slope Curved 2 x 1 No Studs [1/2 Bow]

Bright Green

$0.37

$0.73

2 x $0.37

$0.73

Brick Round 2 x 2 Dome Top with 2 Ears

Bright Pink

$0.35

$0.70

2 x $0.35

$0.70

Flag 2 x 2 Square, Flared Clip Edge [Thick Clips]

White

$0.23

$0.69

3 x $0.23

$0.69

Cylinder Half 2 x 4 x 4

Tan

$0.23

$0.69

3 x $0.23

$0.69

Plant, Leaves Stacked 4 x 5 x 1 2/3

Bright Green

$0.34

$0.68

2 x $0.34

$0.68

Technic Axle Connector Hub with 3 Axles at 120°

Light Bluish Gray

$0.22

$0.65

3 x $0.22

$0.65

Brick Round 2 x 2 Dome Bottom [Open Stud]

Bright Pink

$0.32

$0.65

2 x $0.32

$0.65

Wool / Yarn

Dark Pink

$0.62

$0.62

1 x $0.62

$0.62

Brick Round 4 x 4 Centre Hole

Yellow

$0.59

$0.59

1 x $0.59

$0.59

Large Figure Weapon Lightsaber Hilt with Axle Hole and Two Bar Holders

Reddish Brown

$0.27

$0.54

2 x $0.27

$0.54

Bar 2L with Stop in Center

Tan

$0.11

$0.54

5 x $0.11

$0.54

Bar 2L with Stop in Center

Reddish Brown

$0.18

$0.53

3 x $0.18

$0.53

Plant, Flower, Peony Rose with 2 Layers

Medium Lavender

$0.24

$0.49

2 x $0.24

$0.49

Hose Rigid 3mm D. 9L / 7.2cm

Black

$0.49

$0.49

1 x $0.49

$0.49

Tile 2 x 3

Blue

$0.23

$0.46

2 x $0.23

$0.46

Slope Curved 2 x 2 x 2/3 Inverted

Bright Light Blue

$0.22

$0.43

2 x $0.22

$0.43

Plate 1 x 4

Bright Green

$0.22

$0.43

2 x $0.22

$0.43

Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder

Bright Light Blue

$0.37

$0.37

1 x $0.37

$0.37

Brick Curved 2 x 1 with Inverted Cutout

Bright Light Orange

$0.18

$0.35

2 x $0.18

$0.35

Plate 1 x 2

Dark Orange

$0.07

$0.34

5 x $0.07

$0.34

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout

Bright Pink

$0.34

$0.34

1 x $0.34

$0.34

Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]

Tan

$0.15

$0.30

2 x $0.15

$0.30

Slope 30° 1 x 1 x 2/3 (Cheese Slope)

Bright Light Blue

$0.09

$0.28

3 x $0.09

$0.28

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Bright Green

$0.09

$0.28

3 x $0.09

$0.28

Brick 1 x 2

Dark Orange

$0.09

$0.28

3 x $0.09

$0.28

Plate Special 1 x 2 with Door Rail

Tan

$0.09

$0.28

3 x $0.09

$0.28

Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side

Dark Turquoise

$0.28

$0.28

1 x $0.28

$0.28

Tile Round 1 x 1 with Animal Track Print

Medium Nougat

$0.04

$0.28

7 x $0.04

$0.28

Panel 1 x 2 x 3 [Side Supports / Hollow Studs]

White

$0.14

$0.27

2 x $0.14

$0.27

Brick Special 1 x 1 with Headlight

Bright Light Blue

$0.14

$0.27

2 x $0.14

$0.27

Brick Curved 1 x 2 x 1 No Studs

Tan

$0.12

$0.24

2 x $0.12

$0.24

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Blue

$0.12

$0.24

2 x $0.12

$0.24

Brick Special 1 x 2 with Grille

Tan

$0.08

$0.24

3 x $0.08

$0.24

Cone 1 x 1 [Top Groove]

Tan

$0.04

$0.24

6 x $0.04

$0.24

Animal, Fish [Hollow Stud Mouth]

Bright Light Blue

$0.23

$0.23

1 x $0.23

$0.23

Plate Special 2 x 4 with Groove and Two Center Studs (Jumper)

Bright Green

$0.05

$0.22

4 x $0.05

$0.22

Tile 1 x 2 with Groove

Medium Azure

$0.05

$0.22

4 x $0.05

$0.22

Bar 2L with Stop in Center

White

$0.11

$0.22

2 x $0.11

$0.22

Antenna 1 x 4 with Flat Top

Dark Orange

$0.11

$0.22

2 x $0.11

$0.22

Tile 1 x 4 with Groove

Bright Green

$0.11

$0.22

2 x $0.11

$0.22

Brick 1 x 1

Bright Light Orange

$0.07

$0.20

3 x $0.07

$0.20

Plate Special 1 x 2 with Clip Vertical on End

Reddish Brown

$0.20

$0.20

1 x $0.20

$0.20

Brick 1 x 1

Medium Azure

$0.04

$0.20

5 x $0.04

$0.20

Tile 2 x 2 with Groove

Bright Pink

$0.09

$0.19

2 x $0.09

$0.19

Bar Holder with Clip

White

$0.09

$0.19

2 x $0.09

$0.19

Bar 4L (Lightsaber Blade / Wand)

White

$0.09

$0.19

2 x $0.09

$0.19

Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]

Reddish Brown

$0.09

$0.19

2 x $0.09

$0.19

Brick Arch 1 x 3 x 2 Inverted [Inside Bow]

Medium Azure

$0.09

$0.19

2 x $0.09

$0.19

Headwear Accessory Crown / Tiara

Pearl Gold

$0.09

$0.19

2 x $0.09

$0.19

Brick 1 x 3

White

$0.09

$0.19

2 x $0.09

$0.19

Brick Curved 2 x 1 with Inverted Cutout

Coral

$0.09

$0.19

2 x $0.09

$0.19

Window 1 x 4 x 3 without Shutter Tabs

White

$0.19

$0.19

1 x $0.19

$0.19

Brick 1 x 1

Coral

$0.05

$0.16

3 x $0.05

$0.16

Technic Axle 2 Notched

Red

$0.03

$0.16

6 x $0.03

$0.16

Brick 1 x 2

Coral

$0.05

$0.16

3 x $0.05

$0.16

Plant, Plate 1 x 1 Round with 3 Leaves

Bright Green

$0.04

$0.16

4 x $0.04

$0.16

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Dark Pink

$0.04

$0.16

4 x $0.04

$0.16

Plate 8 x 8 with Rounded End

Magenta

$0.15

$0.15

1 x $0.15

$0.15

Plate Round 1 x 1 with Solid Stud

Bright Pink

$0.03

$0.14

5 x $0.03

$0.14

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Medium Azure

$0.03

$0.14

5 x $0.03

$0.14

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Bright Green

$0.03

$0.14

5 x $0.03

$0.14

Brick 1 x 4

Medium Azure

$0.07

$0.14

2 x $0.07

$0.14

Brick Arch 1 x 4 x 2

Coral

$0.14

$0.14

1 x $0.14

$0.14

Cupboard 2 x 3 x 2 with Hollow Studs

Blue

$0.14

$0.14

1 x $0.14

$0.14

Tile 1 x 2 with Groove

Dark Turquoise

$0.07

$0.14

2 x $0.07

$0.14

Dish 2 x 2 Inverted [Radar]

Blue

$0.07

$0.14

2 x $0.07

$0.14

Slope 33° 3 x 2

Reddish Brown

$0.14

$0.14

1 x $0.14

$0.14

Brick 1 x 2

Bright Light Orange

$0.04

$0.12

3 x $0.04

$0.12

Bar Holder with Hole and Bar Handle

Reddish Brown

$0.12

$0.12

1 x $0.12

$0.12

Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale)

Tan

$0.12

$0.12

1 x $0.12

$0.12

Container Box 2 x 2 x 1 Reinforced Bottom

Bright Light Orange

$0.12

$0.12

1 x $0.12

$0.12

Equipment Candlestick

Black

$0.12

$0.12

1 x $0.12

$0.12

Plate Round 1 x 1 with Hollow Stud and Horizontal Bar 1L

Black

$0.05

$0.11

2 x $0.05

$0.11

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Green

$0.05

$0.11

2 x $0.05

$0.11

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Tan

$0.03

$0.11

4 x $0.03

$0.11

Tile 2 x 2 Curved, Macaroni

Coral

$0.05

$0.11

2 x $0.05

$0.11

Plate 2 x 4

Orange

$0.05

$0.11

2 x $0.05

$0.11

Plate Round 1 x 1 Swirled Top / Poo

Reddish Brown

$0.05

$0.11

2 x $0.05

$0.11

Bar 5L with Handle (Friction Ram)

Black

$0.11

$0.11

1 x $0.11

$0.11

Plate 2 x 3

Light Aqua

$0.11

$0.11

1 x $0.11

$0.11

Tile 2 x 2 with Groove

Bright Light Orange

$0.09

$0.09

1 x $0.09

$0.09

Equipment Shovel [Rounded Handle End]

Flat Silver

$0.09

$0.09

1 x $0.09

$0.09

Plate 1 x 1 x 2/3 with Open Stud

Dark Orange

$0.09

$0.09

1 x $0.09

$0.09

Plate Special 1 x 2 Rounded with 2 Open Studs

Tan

$0.09

$0.09

1 x $0.09

$0.09

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Lavender

$0.03

$0.08

3 x $0.03

$0.08

Tile Round 1 x 1 with Offset Black Eye Print

White

$0.03

$0.08

3 x $0.03

$0.08

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Bright Light Yellow

$0.03

$0.08

3 x $0.03

$0.08

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Bright Pink

$0.08

$0.08

1 x $0.08

$0.08

Plate Round 1 x 1 with Solid Stud

Trans-Light Blue

$0.04

$0.08

2 x $0.04

$0.08

Headwear Accessory Hat with Small Pin, Clown / Party with Pin

Pearl Gold

$0.08

$0.08

1 x $0.08

$0.08

Wedge Plate 2 x 4

Blue

$0.08

$0.08

1 x $0.08

$0.08

Wave / Flame Small with Pin

Trans-Orange

$0.04

$0.08

2 x $0.04

$0.08

Technic Pin 1/2

Light Bluish Gray

$0.04

$0.08

2 x $0.04

$0.08

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout

Yellow

$0.07

$0.07

1 x $0.07

$0.07

Turntable 2 x 2 Female

White

$0.07

$0.07

1 x $0.07

$0.07

Brick Arch 1 x 4

Bright Light Orange

$0.05

$0.05

1 x $0.05

$0.05

Dish 2 x 2 Inverted [Radar]

Trans-Light Blue

$0.05

$0.05

1 x $0.05

$0.05

Cone 1 x 1 [Top Groove]

Trans-Light Blue

$0.05

$0.05

1 x $0.05

$0.05

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Medium Azure

$0.03

$0.05

2 x $0.03

$0.05

Plate Special 1 x 2 with Clip Horizontal on Side

White

$0.05

$0.05

1 x $0.05

$0.05

Headwear Accessory Bow with Heart, Long Ribbon and Pin

Lavender

$0.03

$0.05

2 x $0.03

$0.05

Plate 2 x 2

Light Bluish Gray

$0.05

$0.05

1 x $0.05

$0.05

Tile Round 1 x 1

Trans-Yellow

$0.03

$0.05

2 x $0.03

$0.05

Technic Brick 1 x 2 [1 Pin Hole]

Reddish Brown

$0.04

$0.04

1 x $0.04

$0.04

Plate 2 x 4

Medium Lavender

$0.04

$0.04

1 x $0.04

$0.04

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Yellow

$0.04

$0.04

1 x $0.04

$0.04

Plate Round Corner 6 x 6

Lime

$0.04

$0.04

1 x $0.04

$0.04

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Medium Nougat

$0.03

$0.03

1 x $0.03

$0.03

Missing pricing information on the following items.

Part		Color	Quantity
	Sticker Sheet for Set 42666-1	[No Color/Any Color]	1
	Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version]	Medium Azure	1

Minifigures included in set 42666-1.

Price source:

Minifigure		Quantity	Value
	Leo - Red Shirt, Yellow Shorts fig-016290, frnd0846, BOID 948583	1	$2.49
	Paisley - Bright Light Yellow Top, Medium Lavender Skirt fig-015754, frnd0819, BOID 1447235	1	$3.19
Total minifigure value:			$5.68

Compare the value of buying Cat Birthday Party & Tree House as a complete set versus the total value of all parts individually.

Value Breakdown
Parts value	$65.67
Minifigure value	$5.68
Total inventory value	$NaN

BrickLink
Condition	Timespan	Avg price	Items sold	Inventory value	Ratio
New	6 months	?	?	$60.95	?
Used	6 months	?	?	$0.00	?

Brick Owl
Condition	Timespan	Avg price	Inventory value	Ratio
New	Current	$32.60	$81.04	2.49
	6 months	?	$67.10	?
	1 year	?	$72.20	?
Used	Current	?	$66.83	?

Combined 6 Month Sales Volume (New)
Total items sold	?

Find the cheapest offers for set 42666-1 from sellers on secondary marketplaces like Brick Owl and eBay. As an eBay Partner Network Affiliate and Brick Owl Affiliate, I earn from qualifying purchases.

Item		Price

BrickLink history of 0 sales with 0 total item quantity. Item condition: New.

Remove outliers

No sale history available.