Developer NES Game Cartridge
Gaming enthusiast Rob Walter purchased an old box of Nintendo Entertainment System cartridges from a garage sale in 2006 for $40. He got a bargain, as the box’s contents proved to be worth a combined $50,000. It included a rare developer cartridge used for the 1991 Nintendo Campus Challenge, in which the game toured the U.S. as part of a promotion. This cartridge alone sold for over $20,000 on eBay.