Sometimes Target gets bundles for the Gamecube with an extra controller (so you get 2) and one of their family games (Smash Bros., Mario Kart, ect.) for $99.
I got my GC with 2 controllers, memory card for $80 with shipping from ebay last fall... Edit: above post sounds better.
you just need it to save games, cause the games are on cds now just get one of the cheaper ones, it'll suit you just fine itll run you maybe 20-30 dollars
I'd visit cheapassgamer.com for some good deals on some cheap but quality games. Now's a great time to buy Xbox/PS/GC games you might've missed or haven't heard of.