Western Digital offers the factory-refurbished Western Digital My Book Essential 2TB USB 3.0 External Hard Drive (pictured), model no. WDBACW0020HBK-NESN, for $109.99. Coupon code "WDCARES" drops it to $94.99. With free shipping, that's $0.05/GB and $30 under the lowest total price we could find for a new one, although we saw a new unit for $5 less last November. 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. A 6-month Western Digital warranty applies.

Of note, Western Digital also offers the factory-refurbished Western Digital Elements 1TB USB 2.0 External Hard Drive, model no. WDBAAU0010HBK-NESN, for $54.99. Better yet, buy two for $109.98 and apply the above coupon to drop it to $94.98. With free shipping, that's $0.05/GB, $47.49 each, and $111 under the lowest total price we could find for a pair of new units elsewhere. (We did see a refurb for $9 less per unit a year ago.) It features a maximum data transfer rate of 480MB/s. A 6-month Western Digital warranty applies.