A 1990 Nintendo World Championship NES cartridge is up on eBay with a "Buy-It-Now" price of $12,000. There were only 116 ever made, and this is one of 90 grey ones given to semi-finalists. The other 26 are gold, like the old Zelda cartridges, and were given to winners and runners-up of a Nintendo Power contest (one recently sold for $20,000+). Check out the Wikipedia page for more details on the competition. The cartridge has versions of Super Mario Bros., Rad Racer, and Tetris on it. It's considered the 3rd rarest game of all time, with gold ones being the 1st. If you end up purchasing this item please buy me a new car for letting you know about it. Or if you have the money but don't want the game we could get together and pound $12,000 of booze and hookers. I'm flexible. But not mobile, so you'll have to come pick me up.