Staples retail stores offer the Western Digital My Book Essential 3TB USB 3.0 External Hard Drive, model no. WDBACW0030HBK-NESN, for $139.99. This printable coupon cuts it to $111.99 ($0.04/GB). That's $28 under our June mention and the lowest total price we could find by $18. It's also the best price we've seen for any 3TB USB 3.0 external hard drive. 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. Deal ends July 30.