Game Boy
Average original price: $90
Potential earnings: $750 -1,500
Before tablets and mobile phones were introduced to the world, children were obsessed with Nintendo’s Game Boy. Almost every kid owned one of these from 1989 onward. The Game Boy was selling for about $90 when it first came out, and now you can earn more than $1,500 by selling it on eBay. Those who have the diamond-encrusted and gold-plated special edition are in for a fat paycheck of $25,000!