Best Buy offers the Toshiba 1.5TB Canvio Basics Portable USB 3.0 External Hard Drive, model no. HDTC615XK3B1, for $89.99 with free shipping ($0.06/GB). That's the lowest total price we could find by $15, although we saw it for $5 less last week (since expired). This USB-powered drive features an 8MB cache and runs at 5400 rpm.