ok, I was going to buy a used Nintendo DS from a guy I know. he was asking between 60 - 70 bucks for it. it's 2 years old (he got it at launch) and it's in pretty good shape. he takes care of his stuff. how much do you guys think it's worth? I don't want to rip him off, and he doesn't want to sell it for too cheap lol... it's a weird situation.