I don't know if this is a national thing or just locally here. (some employee making a quick buck) If you go to a GameStop here. Purchase a used/refurbished one. Take it home, open it up to mod it. You have about an 80% chance of discovering you just purchased an xclamp modded console. Screw being banned, I personally could care less about that. Selling me an xclamp modded console- that's war!
You can buy a broken 360 on CL for $40(with cords etc...) Xclamp it, and sell it to GameStop for $90. $50 profit for 30min of work. No wonder so many people get screwed over from GameStop.