Not all retired LEGO sets explode in value, but a few low-key winners are heating up in 2025. These aren’t $500 whales — they’re sets most flippers overlook.

• LEGO Creator 3-in-1 Pirate Ship (31109): Under the radar, but trending up fast on eBay and BrickLink.
• LEGO Ideas Tree House (21318): Classic appeal, sustainable theme, and a growing fanbase.
• LEGO Speed Champions (older 2-car sets): Smaller investment, solid margins as car collectors jump in.
• LEGO DOTS & Friends Crossover Packs: Low original price, high nostalgia value — sleeper flips.

Want more picks and resale strategies? Check out the full guide: How to Flip Retired LEGO Sets Online.