LEGO Cat Birthday Party & Tree House (42666)
LEGO Cat Birthday Party & Tree House, set number 42666, is a Friends set of 321 pieces with 2 minifigures, released in June 2025. Its recommended retail price was $29.99. It is due to retire in December 2026.
Specifications
- Set number
- 42666-1
- Theme
- Friends
- Subtheme
- Pets
- Pieces
- 321
- Minifigures
- 2
- Exclusive minifigures
- 1
- Released
- June 2025
- Retirement date
- December 2026
- MSRP (USD)
- $29.99
- MSRP (GBP)
- £24.99
- MSRP (EUR)
- €29.99
- MSRP (CAD)
- CA$39.99
- Amazon price
- $26.90
- Amazon 90-day average
- $25.48
- Amazon price vs MSRP
- -10.30%
- BrickLink new from
- $27.75
- BrickLink new from vs MSRP
- -7.47%
- New sold on BrickLink in 6 months
- 0
- Used sold on BrickLink in 6 months
- 0
Minifigures in this set
- Paisley - Bright Light Yellow Top, Medium Lavender Skirt (fig-015754)
- Leo - Red Shirt, Yellow Shorts (fig-016290)
More sets in Pets
- LEGO Nova's Doghouse Build (30697-1)
- LEGO Garden Bunny House (30722-1)
- LEGO Mia's Puppy House (3934-1)
- LEGO Stephanie's Pet Patrol (3935-1)
- LEGO Andrea's Bunny House (3938-1)
- LEGO Heartlake Dog Show (3942-1)
- LEGO German Shepherd and Puppy (40440-1)
- LEGO Shorthair Cat and Kitten (40441-1)
- LEGO Goldfish and Fry (40442-1)
- LEGO Budgie and Chick (40443-1)
- LEGO Dalmatian and Puppy (40479-1)
- LEGO Ginger Tabby and Kitten (40480-1)
Showing 12 of 53 sets.
Parts in this set
- LEGO part 53451
- LEGO part 2652pr0007
- LEGO part 2652pr0003
- LEGO part 69902pr0003
- LEGO part 69902pr0004
- LEGO part 11602pr0010
- LEGO part 64648
- LEGO part 3957b
- LEGO part 3484
- LEGO part 78258
- LEGO part 78258
- LEGO part 78258
Showing 12 of 20 parts.
Price tracking
StudFinder tracks Cat Birthday Party & Tree House across Amazon and BrickLink and alerts you when the price falls past the discount you choose. Amazon most recently listed it at $26.90. The cheapest new BrickLink listing is $27.75. Full price history, retirement status and current deals are shown above.
How these prices are measured
The Amazon 90-day average of $25.48 is the mean of the lowest new Amazon listing for this set over the last 90 days, in US dollars. BrickLink figures are quoted for United States sellers in US dollars: "new from" is the lowest price a seller is currently asking, while the six-month averages are quantity-weighted means of the sales that actually completed on BrickLink over the last six months. Each "vs MSRP" figure compares that price with this set's $29.99 recommended retail price.
Price sources
StudFinder does not sell LEGO. Every price above was observed at one of these marketplaces — follow a link to see what it costs there now.
- LEGO Cat Birthday Party & Tree House on Amazon ($26.90)
- LEGO Cat Birthday Party & Tree House on BrickLink (new from $27.75)
- LEGO Cat Birthday Party & Tree House on LEGO.com (RRP $29.99)
Common questions
How much does LEGO Cat Birthday Party & Tree House (42666) cost?
LEGO Cat Birthday Party & Tree House launched at a recommended retail price of $29.99. Amazon most recently listed it at $26.90. The cheapest new listing on BrickLink is $27.75. That is 7.47% below its $29.99 MSRP.
Is LEGO 42666 retired?
Not yet. LEGO Cat Birthday Party & Tree House is scheduled to leave production in December 2026, after which it will only be available second-hand. BrickLink sellers already list new copies from $27.75.
How many pieces does LEGO Cat Birthday Party & Tree House have?
LEGO Cat Birthday Party & Tree House (42666) contains 321 pieces. It also includes 2 minifigures, 1 of which appear in no other set.
