U would probably have to go through amazon or eBay for that stuff. The GameStop near by stopped selling GameCube stuff because of all the new systems that came out
You can also get games on here( i had some posted and will have more next week) :) none of the games stops around here have games (MN) but it may vary by area. Also craigslist is a good place to get games and thrift stores also try flea markets or yard sales also you can google site that sell them online :) hope that helps good luck with the auction!!