here are a lot of places to buy cheap Wii games. You can't buy classic Mario in the stores. The only way to buy it would be to buy Wii points and purchase them online or get a membership to a Wii Downloads site.
You pay a one time fee (usually the cost of one Wii Game) and you can download unlimited Wii Games (also movies, tv shows and music)
Ebay- Ebay is a great place to find them. Try checking auctions that only have a few minutes left and place a bid. That will increase your chances of winning and getting a good deal.
Video stores- Sometimes Local video stores sell games when they become less popular.
Craig's list. There are tons of deals for anything- including video games On craigslist.
