Set 31378
Space Exploration Telescope
On shelves nowRetail price$34.99What LEGO charged
Worth now$47.00Typical sealed asking price · 15 listings
Recently sold$46.99Only 2 sales so far — too few to lean on
vs retail+34%Worth more than it cost
Not at retail
At $35 retail there's no margin left — pay under $20.
How much is LEGO 31378 Space Exploration Telescope worth?
LEGO 31378 Space Exploration Telescope is worth about $47.00 sealed right now, based on 15 live sealed listings on eBay. That's 34% above its $34.99 retail price. It came out in 2026 with 278 pieces. It's still sold in shops. Its typical asking price has held steady over the last 86 days. We last checked it 8 days ago.
Price history
Value history
Oct 20$4715 listings
- Lowest
- $45
- Highest
- $50
- Change
- 0%
- Asking vs retail
- +34%
27 observations · median asking · rechecked 8× daily
Should you buy it?
15 listings. Solid number.
If you bought it to resell
Sells sealed for$47
Marketplace fees · 15.25%−$7
Payment processing · 2.9% + $0.30−$2
Shipping · est. from 278 pieces−$9
Reaches you$29
Pay no more than$22
For a 30% return at your costs. Change them and every figure on the site follows.
How long has it been on shelves?
Still early — released 2026, and sets like this usually run about 3 years. No hurry.
LEGO never announces retirement dates. This is only how long the set has been available against how long sets of its size usually run — not a prediction, and not inside information.
What it actually sold for
Sealed
$47
2 sold in six monthsUsed
$19
2 sold in six monthsCompleted BrickLink transactions over the last six months. Real sales, not asking prices.
Set details
- Set number
- 31378
- Theme
- Creator · Creator 3-in-1
- Released
- 2026
- Status
- On shelves now
- Pieces
- 278
- Minifigures
- —
- Retail price
- $34.99
- Value per piece
- $0.169
- Price confidence
- high · 15 listings
- Last checked
- 8 days ago
Where these numbers come from
eBay15 live listingsThe asking price here — the median of what sellers want right now, $47. Last checked Oct 20.See the listings →BrickLink2 completed salesWhat it actually sold for — $47 across six months of real transactions. Last checked Oct 24.Open the price guide →Catalogue278 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $35.See the catalogue entry →
eBay links are affiliate links — if you buy after clicking, we earn a small commission at no cost to you, and that is what pays for the site. BrickLink has no such programme, so those are plain links. Neither changes what we show or what we say about it.
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.
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