check this out FACTORY SEALED NEW NES NINTENDO STADIUM EVENTS NTSC - eBay (item 140384097750 end time Feb-26-10 20:10:41 PST)
Actually the most expensive one sold on Ebay was US $11,600.00 http://cgi.ebay.com/ws/eBayISAPI.dll...Q_fviZ1&_rdc=1 Info