Best Buy via eBay offers the Western Digital 5TB My Book USB 3.0 External Hard Drive, model no. WDBFJK0050HBK-NESN, for $109.99 with free shipping. That's $10 under our mention from Black Friday weekend and the lowest total price we've seen. (It's a current low by $30.) It features cloud backup and up to 5Gb/s data transfer speeds.