How much can I sell my Nintendo 3DS XL for at GameStop or Disc Replay?

[LilyLaceration]

I received my pink 3DS XL for my birthday in November, 2012 and I don't use it very much at all. It's in perfect condition and I have the charger and stylus.
How much would I get for it if I took the cash option? (I wouldn't take the credit option because I've already got all the games I want right now and I need the cash.)
Also, would GameStop give me more money, or would Disc Replay be a better option?
Thanks!

 

[Andrew1]

dont sell it and wait for animal crossing new leaf