Best Buy offers the Western Digital My Book Essential 2TB USB 3.0 External Hard Drive, model no. WDBACW0020HBK-NESN, for $89.99. (Click through to Best Buy to see this price.) With free shipping, that’s $0.04/GB, $10 under our June mention, and the lowest total price we could find by $10. Sales tax is added where applicable. This drive is purported to run 3x faster than a similar USB 2.0 device when connected to a USB 3.0 port. It also features password protection with hardware encryption.