The Game Boy Hard Drive is a hard drive that is made from an actual old recycled Game Boy that was hollowed out to have a hard drive thrown in along with ports for USB connections drilled into the shell. Finally show your true nerdiness anytime you need some files from friends or family, they will now assume your hard drive is filled with old NES ROMS, Pokemon crap, and probably a little Anime porn as well. The Game Boy Hard Drive is USB 3.0 compatible, comes with a USB cable, comes in three different hard drive sizes to choose from, a 500GB drive for $109.99, a 1TB drive for $129.99, and a 2TB drive for $159.99. Other colors of the Game Boy Hard Drive are available by special order.
Or if you're feeling so inclined and you already own a Game Boy that you don't want to play with anymore, you can try making a hard drive out of it yourself by following the instructions on this Instructables page.
If you're into Game Boy mods be sure to check these out: