i just bought the 4 gb xbox 360 slim in gamestop for 200$ and i was wondering is there anyway to order the 120gb harddrive or 250 gb harddrive off ebay or somethin?

I just want to let you know now. The old Xbox 360 had a removable hard drive. I don't know why but Microsoft made the hard drives in the slim Xbox 360 unremovable. I don't think it was a good idea because many people, like you, would want to upgrade the hard drive on their 360 slim. I don't know but you probably would be able to remove the hard drive but I don't know how many people would be able to put back together a 360 with hundreds of little pieces. But I don't even think they sell hard drives so I think you're stuck, sorry.