From looking at completed ebay listings,I'd say it's worth between $50 and $80. People buy old games--I paid $50 for an atari 2600 years ago, and one of these days, I want to buy an old Commadore just so I can play games like Gold Rush and Heart of Africa. (I even still like text games like the ones Infocom made.) I'd let it go at $20 though unless you'd really ebay it. To most people it wouldn't be worth much.