Friends

Cat Birthday Party & Tree House

42666
321 pieces
Retiring End of this year
BUYING ADVICE
✅Good deal
20% OFF
A solid 20% discount. This is a good deal based on this set's typical pricing. Retiring within 3 months, so stock is dwindling and deals can vanish fast. It has been as low as $20.99 (30% off), so the current deal is good but not the best we've seen. Price just dropped from $26.50.

retail price

$29.99

 

best price

$23.99

-$6.00

Lowest ever: $20.99 at Amazon US (9 Oct 2026)

This set is 20% off - watch it to get notified of even bigger drops

About LEGO Cat Birthday Party & Tree House

Friends characters Leo and Paisley celebrate with their feline companions in this 321-piece cat-themed building set. The centrepiece is a detailed cat tree house featuring multiple levels for play, complete with a fish-shaped piñata containing hidden treats, interactive cat toys, fresh cat grass, and a working water fountain system.

The set includes 2 minidolls and 5 cat figures, allowing for varied storytelling scenarios. Leo and Paisley can host elaborate birthday celebrations using the included buildable cake scene, complete with candle, wrapped gifts, and festive decorations. Cat-shaped balloons, colourful banners, birthday hats, and special cat treats add authentic party atmosphere to the build.

Interactive Features

The tree house design encourages active play with its multi-level structure where cats can climb, rest, and play. Each level offers different activities, from the treat-dispensing piñata to the refreshing water feature, creating realistic pet care scenarios.

The main tree house model measures over 18 cm high, 16 cm wide, and 10 cm deep, providing substantial play space while remaining compact enough for bedroom display. Suitable for builders aged 6 and up, the set combines construction challenges with imaginative role-play opportunities centred around friendship and pet care themes.

Where to Buy LEGO Cat Birthday Party & Tree House for the Best Price

We've been tracking prices for this set since July 2026. The recommended retail price is $29.99. It's currently available from 10 retailers, with Scheels offering the best price at $23.99, which is 20% below RRP. The lowest price we've ever recorded was $20.99 at Amazon US in October 2026, 30% off RRP. Over its tracked history, prices have ranged from $20.99 to $33.69. This set is expected to retire end of this year, so prices may increase as availability decreases.

Set Details

Set Number
42666
Pieces
321
Theme
Friends
RRP
$29.99
Best Price
$23.99
Price per Piece
0.07p
Browse all Friends sets →

Price History

Weekly view

Additional Images

Price History

Boscov's
05/11/2026
$25.49
Best Buy
03/11/2026
$29.99
Macy's
30/10/2026
$29.99
HobbyTown
27/10/2026
$29.99
Scheels
22/10/2026
$23.99
Staples
19/10/2026
$33.69
Kroger
17/10/2026
$29.99
Amazon US
14/10/2026
$26.50
Barnes & Noble
01/10/2026
$29.99
LEGO
04/08/2026
$29.99