How much would Gamestop buy my Original Xbox 360 for?

You could try and sell it on Craigslist or Facebook or Ebay, because you would not get much from Gamestop. The most you'd get is like 60 or 70 bucks. Also, you might as well sell your harddrive, because the new systems don't use the same hard drives. You could get an extra 20-30 maybe more for that alone. Like I said, don't sell it to Gamestop, they'll rip you off hardcore.