As one of its daily deals, Tech For Less offers the Western Digital My Passport Essential 500GB Portable USB 2.0 2.5" External Hard Drive for Mac in Black, model no. WDBAAB5000ACH-NESN, for $44.97 with free shipping ($0.09/GB). That's $15 under our mention of a refurb last spring and the lowest total price we've seen for this drive. It's formatted for Macs and is compatible with Time Machine; however, it can be reformatted for use with Windows and Linux. Deal ends March 27 at 9 am ET.