your best bet, gamestop sometimes has that special where they give you a good amount of credit towards a newer system.. i remember trading a broken ds lite *the power switch broke, i told htem that, they still accepted it* and i got like $80 credit towards a new ds lite. this was like in 07 though and i ended up selling that ds a few months later *i still want another one but im not gonna spend over $100 for one right now since its not a priority*