LEGO Cat Birthday Party (42666-1)
The Cat Birthday Party (42666-1) is a LEGO Friends set that was released in May 2025 and is due to retire on December 2026.
This LEGO set has 321 pieces and had a RRP of $29.99 (£24.99 / 29.99€) which equates to a price per piece of 0.09c (0.08p / 0.09€). It has gone down in value by -0.7% and now has a value of $29.78 based on average sale price over the last 6 months.
Price over time
View price history table
| Month | Avg Price | Sales |
|---|---|---|
| Jul 25 | $28.41 | 1 |
| Aug 25 | $30.19 | 0 |
| Sep 25 | $31.96 | 0 |
| Oct 25 | $33.74 | 0 |
| Nov 25 | $35.51 | 0 |
| Dec 25 | $39.07 | 1 |
Minifigures
This set contains 2 minifigures with a combined value of $2.67. All of the minifigures in this set are exclusive, meaning they don't appear in any other LEGO sets.
Monthly sales
We have recorded 2 sales of the Cat Birthday Party set since Jul 25. The chart below shows the number of recorded sales per month, which can help indicate the popularity and availability of this set on the secondary market.
Value breakdown
The current value of Cat Birthday Party is $29.78
The 2 minifigures in this set make up 9% of the total set value.
The Friends Paisley - Bright Light Yellow and Medium Lavender Tank Top, Medium Lavender Shorts, Dark Tan Shoes minifigure is the most valuable minifigure in this set who contributes 4% of the set value .
My collection
Set details
Name: Cat Birthday Party
Theme: Friends
Set number: 42666-1
Status: Active
Pieces: 321
Minifigures: 2
May 7, 2025
May 7, 2025
May 7, 2025
May 7, 2025
Dec 31, 2026 (est.)
Dec 31, 2026 (est.)
Dec 31, 2026 (est.)
Dec 31, 2026 (est.)
Shelf life: 11 months
$29.99
£24.99
29.99€
0.093c
0.078p
0.093€
Set value
Confidence: Low
Current value: $29.78
Increase from RRP: -0.7%
ROI Prediction
We estimate that 2 years after retirement the value of this set will have increased by 11.06%.
However it could be as low as -12.24% or as high as 25.12%
Minifigures
Set colors
The Cat Birthday Party has 321 pieces and is ranked 3663 on the list of biggest LEGO sets ever made.
The most common colour in this set is Tan
The most common part in this set is Plant Plate, Round 1 x 1 with 3 Layered Leaves
Stats
Frequently Asked Questions
How much is the LEGO Cat Birthday Party (42666-1) worth?
The LEGO Cat Birthday Party is currently worth $29.78 based on the average sale price over the last 6 months. The original retail price was $29.99.
How many pieces are in the LEGO Cat Birthday Party?
The LEGO Cat Birthday Party (42666-1) contains 321 pieces, making it the 3663rd biggest LEGO set ever made.
Is the LEGO Cat Birthday Party still available?
Yes, the LEGO Cat Birthday Party is currently still active and available for purchase. The retail price is $29.99.
How many minifigures are in the LEGO Cat Birthday Party?
The LEGO Cat Birthday Party contains 2 minifigures, 2 of which are exclusive to this set. The minifigures include: Friends Paisley - Bright Light Yellow and Medium Lavender Tank Top, Medium Lavender Shorts, Dark Tan Shoes, Friends Leo - Coral and Magenta Checkered Sleeveless Shirt, Yellow Cropped Trousers, Medium Azure Shoes.
When was the LEGO Cat Birthday Party released?
The LEGO Cat Birthday Party (42666-1) was released in May 2025 as part of the Friends theme.
Price data last updated: Dec 25
