Best Buy offers the Western Digital 1.5TB Portable USB 3.0 External Hard Drive, model no. WDBY8L0015BBK-NESN, for $99.99 with free shipping ($0.07/GB). (Amazon offers it for the same price.) That's the lowest total price we could find by $20, although we saw it for $10 less in December. Sales tax is added where applicable. It features a data transfer rate of up to 5 Gbps.