Fry’s Electronics offers the Maxtor OneTouch 4 Mini 500GB USB 2.0 External Hard Drive, model no. ST905003OTA3E1-RK, for $99.99 with free shipping ($0.20/GB). That’s the lowest total price we could find by a buck. Sales tax is added where applicable. This PC- and Mac-friendly drive spins at 5400 rpm and features a 8MB buffer.