Just wanted to share...
I stopped by gamestop today and the clerk gave the lady in front of me two used 360 controllers for free (claiming they were both slightly defective (i.e. had names written on them) and couldn't be sold otherwise). I went to buy deus ex pre-owned and got an upgrade to a sealed collectors edition for free.
I think GS is just clearing out it's non-sku inventory and handing surplus out. Maybe it's just my store, but regardless, stop by in the next few days and maybe you'll get bumped with some free games.