Newegg via eBay offers the Seagate 5TB Backup Plus USB 3.0 External Hard Drive, model no. STDT5000100, for an in-cart price of $129.99 with free shipping. That's tied with yesterday's expired mention as the lowest total price we've seen for any 5TB USB 3.0 hard drive. (It's also a current low for this model by $20.) It features automatic backup options.