Western Digital offers the factory-refurbished Western Digital 1TB My Passport Portable USB 3.0 External Hard Drive for Mac, model no. RWDBLUZ0010BSL-NESN, for $59.99 with free shipping. That's the lowest total price we could find by $11 for a new model. It features password protection and hardware encryption and can also be reformatted for use with a PC. A 6-month Western Digital warranty applies.

Also available is the factory-refurbished Western Digital 4TB My Book Thunderbolt Duo External Hard Drive, model no. RWDBUPB0040JSL-NESN, for $299.99 with free shipping. That's $40 below our November refurb mention and the lowest total price we could find by $145 for a new model today. It's configurable for maximum speed (RAID 0), data protection/mirror mode (RAID 1), or individually in JBOD mode. A 6-month Western Digital warranty applies.