How much are my DSi and DS games worth at gamestop?

I just need an estimate, I have: a black DSi in great condition, Kingdom Hearts 358/2 Days, Mario Kart DS, Super Mario 64 DS, Mario %26amp; Luigi: Bowser's Inside Story, Professor Layton and the Curious Village, Brain Age, Legend of Zelda: Phantom Hourglass, Pokemon Platinum and Scribblenauts. And, any suggestions to sell my games elsewhere that is not online.How much are my DSi and DS games worth at gamestop?
They are worth jack sh*t, to Gamestop at least. They will pay you dirt then turn around and sell them for 10x what they paid you or more. Not online? Why? You'll get the most online. Are you not able to sell online, or are you just afraid too? I urge you to reconsider as you WILL get the most online. If you don't like Ebay or anything like that, Amazon has a really cool trade in thing. You just ship your games to them and they'll deposit the money into your Amazon account. If you prefer to have money that you can spend anywhere and not just at Amazon, Play N' Trade is your best bet. Look and see if you have one around you. Do NOT resort to Gamestop no matter what, unless you want to be ripped off, in which case go for it.