Online Games Download Site

I want to sell my nintendo ds lite to get some extra money. Also, about how much will they pay for a game?

I have a Nintendo-barely works. You have to put the game in just right. And it has 10 games, 2 controllers, 2 guns(for Duck Hunt), and all the hook ups. All extras work fine.
Do you think I should try to sell it or just throw it out?
How much should I sell it for?
Thanks.