Grassroots Computers via Buy.com offers the refurbished Western Digital My Passport Essential 320GB Portable Hard Drive, model no. WDBACY3200ABK, for $39.99 with free shipping ($0.12/GB). That's $13 under our June mention and the lowest total price we could find for a refurb by $6. It features an 8MB cache, maximum data transfer rate of 5Gb/s, and backward compatibility with USB 2.0. A 6-month Western Digital warranty applies.

Note: No warranty information is provided.