This might look like your run-of-the-mill Mega Man NES cartridge, but there's a bit more to it than meets the eye -- it's actually a working external hard drive.
Jammed inside the NES classic is 500GB worth of storage. It works with any PC, power supplied via USB. The best part? It's on sale for $150 at Etsy. Custom orders are acceptable, so if you want more HD space or a different game, just contact the seller.
Complete listing here.