Depends on condition. Since it's patent is expired, the only real value it has is as a Collector's item. If you have one mint, it could probably sell for $200 or so. Most of the time you'd be lucky to get more than about $10-$20 for it though--including shipping.
Generally, the average price for the Super Nintendo System is $50 on eBay. The Super Nintendo Entertainment System is a video game console of 16-bits, and it was released by Nintendo between the years of 1990 and 1993.