Best Platform for Selling Building Sets & Bricks in 2026
Retired LEGO sets appreciate faster than most collectibles -- sealed boxes command 2-5x retail within a few years.
The honest first routes for Building Sets & Bricks
For building sets and bricks, start with eBay and use Mercari as the cleaner second check. The honest winner usually depends on completeness, retired-set status, and whether the listing behaves like collector inventory or family value inventory.
Best first check: eBay
Strongest baseline for retired sets, collector demand, and issue-specific search behavior.
Open eBay routeCleaner second check: Mercari
Best simple-fee comparison when the same lot can move at the same price.
Open Mercari routeDo not skip the inventory check
Missing instructions, broken-down lots, or weak box condition can erase a close marketplace edge quickly.
Fee comparison for Building Sets & Bricks
| Platform | Fees | You Keep | Effective Rate | vs Cheapest |
|---|---|---|---|---|
| Depop | $5.80 | $156.20 | 3.6% | Lowest |
| Etsy | $15.84 | $146.16 | 9.8% | +$10.04 more |
| Mercari | $16.20 | $145.80 | 10.0% | +$10.40 more |
| Facebook Marketplace | $16.20 | $145.80 | 10.0% | +$10.40 more |
| Whatnot | $17.00 | $145.00 | 10.5% | +$11.20 more |
| Grailed | $20.72 | $141.28 | 12.8% | +$14.92 more |
| eBay | $22.43 | $139.57 | 13.8% | +$16.63 more |
| Amazon | $24.30 | $137.70 | 15.0% | +$18.50 more |
| Poshmark | $30.00 | $132.00 | 18.5% | +$24.20 more |
| StockX | $18.00 | $132.00 | 12.0% | +$12.20 more |
Check category rankings against fee data
This category hub ranks marketplace options for Building Sets & Bricks. Use the Fee Index for same-input marketplace rows, Fee Changes for recent policy updates, and Seller Reports for dated summaries before citing a category winner or fee trend.
After the source check, open the top platform calculators with your exact sale price, shipping, item cost, and category assumptions.
Test the winner before you list
Use this category ranking as the shortlist, then run the sale through payout, break-even, shipping, and item-specific guides before choosing the final marketplace.
Depop is the cheapest for Building Sets & Bricks at $150.00, charging $5.80 vs. StockX's $18.00 -- a $12.20 gap.