Here is a sweet a$$ auction on ebay for 658 different NES games. This lot would give anyone an instant nasty collection. The buy it now is a little steep, but I would think it will break $2,500 because of all the rarities that are in there (Caltron 6 in 1 , Flintstones 2)
Here ya go
http://cgi.ebay.com/ws/eBayISAPI.dll...937996710&rd=1