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Retiring Soon

LEGO Cat Birthday Party & Tree House (42666)

LEGO Cat Birthday Party & Tree House (42666)
Set number
42666
Theme
Friends
Pieces
321
Retail price
$29.99
Age
6+
Owner rating
4.9★
Availability
Available now
On retiring list since
September 15, 2026
Check price on Amazon Buy on LEGO.com

On LEGO’s Last Chance to Buy list. LEGO has flagged this set for retirement — once it leaves the list, production ends and the aftermarket is the only way to get one.

LEGO Cat Birthday Party & Tree House is a 321-piece Friends set for ages 6+, currently $29.99 at retail. At $29.99 for 321 pieces it works out to 9.3¢ per piece. It’s the 13th-priciest of the 21 Friends sets currently on LEGO’s retiring list. We first spotted it on the Last Chance to Buy list on September 15, 2026. LEGO.com owners rate it 4.9★ out of 5.

More Friends sets retiring soon

LEGO Family Vacation Beach Resort (42673) Family Vacation Beach Resort 42673 · $129.99 LEGO Plant Café & Flower Shop (42671) Plant Café & Flower Shop 42671 · $99.99 LEGO Comic Book and Game Store (42674) Comic Book and Game Store 42674 · $99.99 LEGO Heartlake City Friends Club House (42689) Heartlake City Friends Club House 42689 · $89.99 LEGO Friendship Camper Van Adventure (42663) Friendship Camper Van Adventure 42663 · $59.99 LEGO Fun Indoor Playground (42686) Fun Indoor Playground 42686 · $59.99

Recently retired Friends sets

LEGO Dog Treats Bakery (42677) Dog Treats Bakery 42677 · was $29.99 LEGO Puppy Playground (42665) Puppy Playground 42665 · was $9.99 LEGO Heartlake City Convenience Store (42680) Heartlake City Convenience Store 42680 · was $19.99 LEGO Friendship Movie Night (42642) Friendship Movie Night 42642 · was $11.99 LEGO Unicorn & Flamingo Pool Party (42658) Unicorn & Flamingo Pool Party 42658 · was $9.99 LEGO Pony Ranch & Stable (42654) Pony Ranch & Stable 42654 · was $69.99

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