The Mountain Cave

Name: LEGO 21137 The Mountain Cave
SKU: 21137

Minecraft · 2017

Sealed market value

$1,899.00

Median asking price across 10 live sealed listings. Sellers' asking prices, not confirmed sales — treat it as a ceiling.

Retired 8 years ago and now 7.6× retail. The people who bought two are very happy.

What it actually sold for

Sealed

$1,808

2 sold in six months · $1,615–$2,000

Sellers are asking 5% more than buyers actually paid. The $1,899 figure above is a ceiling; this is the floor to negotiate toward.

Completed BrickLink transactions over the last six months. Real sales, not asking prices.

Confidence: medium
Listings: 10
Spread: $261.61
Checked: 2 days ago

Should you buy it?

Proven performer

Up 660% on its $250 retail price since retiring. Pay under $1,186 to still make a margin reselling.

Pay no more than $1,186

How that number is worked out

Sells sealed for$1,899

Marketplace fees · 15.25%−$290

Payment processing · 2.9% + $0.30−$56

Shipping · est. from 2,863 pieces−$26

Reaches you$1,527

Pay no more than$1,175

For a 30% return at your costs. Change them and every figure on the site follows.

See listings on eBay

Pieces: 2,863
Minifigs: 6
Released: 2017
Per piece: $0.663
Retail price: $249.99

▲ 660% above its $249.99 retail price

Value history

Sep 11$1,89910 listings

17 observations · median asking · rechecked 8× daily

How to read this. The value is the median of live sealed listings, after removing instructions, empty boxes, used sets, multi-set lots and implausible outliers. Real sale prices usually land below asking, so the buy-below figure is deliberately the conservative end of the range.