As one of its daily deals, Cowboom offers the Western Digital 500GB My Passport Edge Portable USB 3.0 External Hard Drive for Mac, model no. WDBJBH5000ABK-NESN, for $39.99 plus $5 for shipping. That's tied with our mention from a month ago and the lowest total price we could find by $35. It features password protection and hardware encryption and can also be reformatted for use with a PC. Deal ends today.