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

Find the cheapest deal for Cat Birthday Party & Tree House across 5 retailers in The United States.

Shop	Price
	$26.50 - $3.49 (12%)
	$29.95 - $0.04 (0%)
	$29.99
	$29.99
	$29.99

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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: $62.55
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

$0.75

$4.48

6 x $0.75

$4.48

String with End Studs 11L Overall

Black

$1.36

$2.72

2 x $1.36

$2.72

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

Bright Green

$0.48

$2.38

5 x $0.48

$2.38

Plant, Plate 1 x 1 Round with 3 Leaves

Yellowish Green

$0.10

$2.38

25 x $0.10

$2.38

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

Dark Bluish Gray

$2.02

$2.02

1 x $2.02

$2.02

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

White

$2.00

$2.00

1 x $2.00

$2.00

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

Nougat

$1.82

$1.82

1 x $1.82

$1.82

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

Medium Brown

$1.81

$1.81

1 x $1.81

$1.81

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

Lime

$0.53

$1.59

3 x $0.53

$1.59

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

Black

$1.44

$1.44

1 x $1.44

$1.44

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

Bright Pink

$0.48

$1.43

3 x $0.48

$1.43

Wool / Yarn

Bright Light Yellow

$1.33

$1.33

1 x $1.33

$1.33

Plate Round Corner 6 x 6

Blue

$0.63

$1.25

2 x $0.63

$1.25

Container Box 2 x 2 x 1 Reinforced Bottom

Bright Pink

$0.35

$1.06

3 x $0.35

$1.06

Plate 1 x 10

Medium Azure

$0.35

$1.06

3 x $0.35

$1.06

Brick 2 x 3

Dark Orange

$1.03

$1.03

1 x $1.03

$1.03

Plant, Flower with 5 Pointed Petals and Pin

Light Aqua

$0.33

$0.98

3 x $0.33

$0.98

Headwear Accessory Hat with Small Pin, Cap

Lime

$0.46

$0.92

2 x $0.46

$0.92

Plate 6 x 10

Lime

$0.46

$0.92

2 x $0.46

$0.92

Plant, Leaves 4 x 3

Lime

$0.11

$0.87

8 x $0.11

$0.87

Plant, Stem with 3 Leaves and Bottom Pin

Bright Green

$0.12

$0.86

7 x $0.12

$0.86

Technic Axle Connector Smooth [with x Hole + Orientation]

Tan

$0.14

$0.82

6 x $0.14

$0.82

Equipment Candlestick

Reddish Brown

$0.14

$0.82

6 x $0.14

$0.82

Plate Special 1 x 2 Rounded with 2 Open Studs

Bright Green

$0.41

$0.82

2 x $0.41

$0.82

Brick Special 1 x 1 with Studs on 2 Sides

Blue

$0.75

$0.75

1 x $0.75

$0.75

Cylinder Half 2 x 4 x 4

Tan

$0.23

$0.69

3 x $0.23

$0.69

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

White

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

Bright Green

$0.33

$0.65

2 x $0.33

$0.65

Brick Round 2 x 2 Dome Top with 2 Ears

Bright Pink

$0.31

$0.63

2 x $0.31

$0.63

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

Blue

$0.63

$0.63

1 x $0.63

$0.63

Tile Round 1 x 2 Half Circle

Medium Azure

$0.20

$0.61

3 x $0.20

$0.61

Wool / Yarn

Dark Pink

$0.60

$0.60

1 x $0.60

$0.60

Brick Round 4 x 4 Centre Hole

Yellow

$0.58

$0.58

1 x $0.58

$0.58

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

Light Aqua

$0.29

$0.57

2 x $0.29

$0.57

Brick Round 2 x 2 Dome Bottom [Open Stud]

Bright Pink

$0.29

$0.57

2 x $0.29

$0.57

Bar 2L with Stop in Center

Tan

$0.11

$0.54

5 x $0.11

$0.54

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

Reddish Brown

$0.26

$0.52

2 x $0.26

$0.52

Bar 2L with Stop in Center

Reddish Brown

$0.16

$0.49

3 x $0.16

$0.49

Hose Rigid 3mm D. 9L / 7.2cm

Black

$0.48

$0.48

1 x $0.48

$0.48

Tile 2 x 3

Blue

$0.23

$0.46

2 x $0.23

$0.46

Plant, Flower, Peony Rose with 2 Layers

Medium Lavender

$0.22

$0.43

2 x $0.22

$0.43

Brick Curved Inverted 2 x 2 x 2/3

Bright Light Blue

$0.20

$0.41

2 x $0.20

$0.41

Plate 1 x 4

Bright Green

$0.20

$0.41

2 x $0.20

$0.41

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

Bright Light Blue

$0.31

$0.31

1 x $0.31

$0.31

Brick Curved 2 x 1 with Inverted Cutout

Bright Light Orange

$0.15

$0.30

2 x $0.15

$0.30

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

Tan

$0.15

$0.30

2 x $0.15

$0.30

Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)

Bright Light Blue

$0.10

$0.29

3 x $0.10

$0.29

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

Bright Green

$0.10

$0.29

3 x $0.10

$0.29

Brick 1 x 2

Dark Orange

$0.10

$0.29

3 x $0.10

$0.29

Plate Special 1 x 2 with Door Rail

Tan

$0.10

$0.29

3 x $0.10

$0.29

Brick Special 1 x 1 with Headlight

Bright Light Blue

$0.14

$0.27

2 x $0.14

$0.27

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 2 with Grille

Tan

$0.08

$0.24

3 x $0.08

$0.24

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

Tile 1 x 4 with Groove

Bright Green

$0.12

$0.24

2 x $0.12

$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

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

Dark Turquoise

$0.23

$0.23

1 x $0.23

$0.23

Tile 1 x 2 with Groove

Medium Azure

$0.05

$0.22

4 x $0.05

$0.22

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

Bright Green

$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

Brick 1 x 1

Medium Azure

$0.04

$0.20

5 x $0.04

$0.20

Headwear Accessory Crown / Tiara

Pearl Gold

$0.10

$0.19

2 x $0.10

$0.19

Plate Special 1 x 2 with Clip Vertical on End

Reddish Brown

$0.19

$0.19

1 x $0.19

$0.19

Bar Holder with Clip

White

$0.10

$0.19

2 x $0.10

$0.19

Brick 1 x 3

White

$0.10

$0.19

2 x $0.10

$0.19

Brick Curved 2 x 1 with Inverted Cutout

Coral

$0.10

$0.19

2 x $0.10

$0.19

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

Reddish Brown

$0.10

$0.19

2 x $0.10

$0.19

Window 1 x 4 x 3 without Shutter Tabs

White

$0.19

$0.19

1 x $0.19

$0.19

Bar 4L (Lightsaber Blade / Wand)

White

$0.10

$0.19

2 x $0.10

$0.19

Tile 2 x 2 with Groove

Bright Pink

$0.10

$0.19

2 x $0.10

$0.19

Tile Round 1 x 1 with Animal Track Print

Medium Nougat

$0.03

$0.19

7 x $0.03

$0.19

Brick 1 x 1

Bright Light Orange

$0.05

$0.16

3 x $0.05

$0.16

Brick 1 x 1

Coral

$0.05

$0.16

3 x $0.05

$0.16

Brick 1 x 2

Coral

$0.05

$0.16

3 x $0.05

$0.16

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

Medium Azure

$0.08

$0.16

2 x $0.08

$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

Plant, Plate 1 x 1 Round with 3 Leaves

Bright Green

$0.04

$0.16

4 x $0.04

$0.16

Technic Axle 2 Notched

Red

$0.03

$0.16

6 x $0.03

$0.16

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

Tan

$0.14

$0.14

1 x $0.14

$0.14

Dish 2 x 2 Inverted [Radar]

Blue

$0.07

$0.14

2 x $0.07

$0.14

Tile 1 x 2 with Groove

Dark Turquoise

$0.07

$0.14

2 x $0.07

$0.14

Cupboard 2 x 3 x 2 with Hollow Studs

Blue

$0.14

$0.14

1 x $0.14

$0.14

Brick 1 x 4

Medium Azure

$0.07

$0.14

2 x $0.07

$0.14

Brick Sloped 33° 3 x 2

Reddish Brown

$0.14

$0.14

1 x $0.14

$0.14

Plate 8 x 8 with Rounded End

Magenta

$0.14

$0.14

1 x $0.14

$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

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

Brick Arch 1 x 4 x 2

Coral

$0.12

$0.12

1 x $0.12

$0.12

Brick 1 x 2

Bright Light Orange

$0.04

$0.12

3 x $0.04

$0.12

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

Green

$0.05

$0.11

2 x $0.05

$0.11

Tile 2 x 2 Curved, Macaroni

Coral

$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

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

Black

$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

Bar Holder with Hole and Bar Handle

Reddish Brown

$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

Bar 5L with Handle (Friction Ram)

Black

$0.11

$0.11

1 x $0.11

$0.11

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

Tan

$0.03

$0.11

4 x $0.03

$0.11

Plate Special 1 x 2 Rounded with 2 Open Studs

Tan

$0.10

$0.10

1 x $0.10

$0.10

Plate 1 x 1 x 2/3 with Open Stud

Dark Orange

$0.10

$0.10

1 x $0.10

$0.10

Equipment Shovel [Rounded Handle End]

Flat Silver

$0.10

$0.10

1 x $0.10

$0.10

Tile 2 x 2 with Groove

Bright Light Orange

$0.10

$0.10

1 x $0.10

$0.10

Wedge Plate 2 x 4

Blue

$0.08

$0.08

1 x $0.08

$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

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

Pearl Gold

$0.08

$0.08

1 x $0.08

$0.08

Tile Round 1 x 1 with Offset Black Eye Print

White

$0.03

$0.08

3 x $0.03

$0.08

Technic Pin 1/2

Light Bluish Gray

$0.04

$0.08

2 x $0.04

$0.08

Plate Round 1 x 1 with Solid Stud

Trans-Light Blue

$0.04

$0.08

2 x $0.04

$0.08

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

Lavender

$0.03

$0.08

3 x $0.03

$0.08

Wave / Flame Small with Pin

Trans-Orange

$0.04

$0.08

2 x $0.04

$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 4 x 4 with 3 x 3 Quarter Round Cutout

Yellow

$0.07

$0.07

1 x $0.07

$0.07

Plate Round 1 x 1 with Solid Stud

Bright Pink

$0.01

$0.07

5 x $0.01

$0.07

Brick Arch 1 x 4

Bright Light Orange

$0.05

$0.05

1 x $0.05

$0.05

Plate 2 x 2

Light Bluish Gray

$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 Special 1 x 2 with Clip Horizontal on Side

White

$0.05

$0.05

1 x $0.05

$0.05

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

Yellow

$0.05

$0.05

1 x $0.05

$0.05

Turntable 2 x 2 Female

White

$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

Headwear Accessory Bow with Heart, Long Ribbon and Pin

Lavender

$0.03

$0.05

2 x $0.03

$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

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 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	$2.16
	Paisley - Bright Light Yellow Top, Medium Lavender Skirt fig-015754, frnd0819, BOID 1447235	1	$2.83
Total minifigure value:			$4.99

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	$62.55
Minifigure value	$4.99
Total inventory value	$67.54

BrickLink
Condition	Timespan	Avg price	Items sold	Inventory value	Ratio
New	6 months	?	?	$56.96	?
Used	6 months	?	?	$0.00	?

Brick Owl
Condition	Timespan	Avg price	Inventory value	Ratio
New	Current	$32.37	$79.24	2.45
	6 months	?	$64.41	?
	1 year	?	$67.44	?
Used	Current	?	$91.10	?

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

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