Best Buy offers the Toshiba Canvio Basics 320GB Portable 2.5" USB 2.0 External Hard Drive in Black, model no. E05A032BAU2XK, for $29.99 with free shipping ($0.09/GB). That's the lowest total price we've ever seen for any portable 320GB USB drive. Sales tax is added where applicable. This 5400 rpm drive features an 8MB cache.