Newegg via eBay offers the Seagate Backup Plus 4TB USB 3.0 External Hard Drive in Black, model no. STDR4000100, for $109.99 with free shipping. That's $5 under our mention from three weeks ago and the lowest total price we've seen. (It's also a current low by $10.) This 2.5" drive comes with an offer for 200GB of OneDrive cloud storage and is powered via USB.