Western Digital offers its factory-refurbished Western Digital 500GB My Passport Studio FireWire 800 / USB 2.0 2.5" Portable External Hard Drive for Mac, model no. WDBALG5000ABK-NESN, for $49.99 plus $5.99 for shipping. That's tied with our mention from two weeks ago and $54 under the lowest total price we could find for a new unit. This Mac-compatible hard drive features two FireWire 800 ports and an aluminum enclosure. A 6-month Western Digital warranty is included.