Seriously...?! Or trolling?
A sale on a clearance old used hard drive =/= fake knockoff products.
being real. seriously, if you're counting on Gamestop to screen products carefully, you're looking in the wrong place. people sell their banned 360 consoles to Gamestop. people sell systems with failing DVD drives to Gamestop. Gamestop's idea of checking out a system is to boot up a game and see if it loads. Just pray that your dying 360 works when they boot up the game and your console is sold. Not saying it's right and it's definitely something I wouldn't do personally, but I know people that get away with it.
Yes, Gamestop should be more responsible. But when it comes to used, it's used. Caveat emptor. You still get Gamestop's warranty so you have some peace of mind that the product can be easily swapped.
Now, if the hardware is tagged Microsoft refurbished, I'd have more peace of mind because that means it got sent to Microsoft, wiped out and tested, and then repackaged to be resold for ancillary income.
If I saw a 250GB used drive for $30 at Gamestop, fake or not, I'd still buy it. It's still 250GB for $30!