Costco offers its members the Seagate Backup 1TB USB 3.0 Portable Hard Drive in Black, model no. STBU1000100, for an in-cart price of $59.99. (Non-members pay $4 more.) With free shipping, that's $0.06/GB, $7 under last month's mention, and the lowest total price we've seen for this drive without rebate hassles. (It's also a current low by $19.) This USB 3.0 drive is compatible with Windows and Mac. Deal ends June 22.