Back in stock at Best Buy is 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). (It was this price yesterday but sold out quickly.) 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.

Update: It's now only available for in-store pickup.