1. Sky Dancer

AVERAGE OG PRICE: $9.99

MIGHT FLIP FOR: $80

Twin brothers, John, and Anthony Gentile came up with the idea for Sky Dancer. The twins wrangled an aviation expert and a sculptor that worked on Tim Burton’s “Nightmare Before Christmas” to create the flying doll’s design. They flew high and twirled with a pull of a string.

Companies that rejected the Gentiles’ pitch missed out…The toy became wildly popular among young children, especially when they found out they could launch the toy at their siblings. Many of the toys were recalled for safety reasons which just increased their value.