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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.
Starting order
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
Best first check: eBay
Strongest baseline for retired sets, collector demand, and issue-specific search behavior.
Open eBay routeCleaner second check
Cleaner second check: Mercari
Best simple-fee comparison when the same lot can move at the same price.
Open Mercari routeCompleteness pressure
Do not skip the inventory check
Missing instructions, broken-down lots, or weak box condition can erase a close marketplace edge quickly.
Platform comparison
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 |
Insight
Depop is the cheapest for Building Sets & Bricks at $150.00, charging $5.80 vs. StockX's $18.00 -- a $12.20 gap.
FAQ
Building Sets & Bricks marketplace FAQ
What is the best platform to sell Building Sets & Bricks?
Depop has the lowest fees at $150.00, charging $5.80 (3.6%). You keep $156.20 before item costs.
Which platform charges the most for Building Sets & Bricks?
StockX charges $18.00 (12.0%) at $150.00 -- that's $12.20 more than Depop.
How do all platforms rank for Building Sets & Bricks fees?
At $150.00, the ranking from lowest to highest fees is: 1. Depop ($5.80), 2. Etsy ($15.84), 3. Mercari ($16.20), 4. Facebook Marketplace ($16.20), 5. Whatnot ($17.00), 6. Grailed ($20.72), 7. eBay ($22.43), 8. Amazon ($24.30), 9. Poshmark ($30.00), 10. StockX ($18.00).