Staples offers the Western Digital 320GB My Passport Essential Portable 2.5" USB 3.0 External Hard Drive in Charcoal, model no. WDBACY3200ABK, for $39.99 with free shipping. (This price appears on the product page and at checkout, but not in-cart.) That's $0.12/GB, tied with our mention from two weeks ago, and the lowest total price we could find by $18. Sales tax is added where applicable. It features an 8MB cache, maximum data transfer rate of 5Gb/s, and backward compatibility with USB 2.0. Deal expires March 30.