Polly Pocket
AVERAGE OG PRICE: $14.99 (new)
MIGHT FLIP FOR: $1,926 (vintage)
They were tiny, but they were loved. These tiny doll portable sets popular in the 80s and 90s came in various themes – mermaid, princess, you name it! If you managed to keep track of every piece of your Polly Pocket set, you could get some cold hard cash.
Reselling sites, like eBay, are best for selling Polly. Got a Sparkle Surprise Polly Pocket set? Say hello to $449.99! If you have a complete version of one of the larger castle sets, you might be able to flip it for $1,926.