Western Digital offers its factory-refurbished My Cloud 4TB NAS, model no. WDBCTL0040HWT-NESN, for $154.99 with free shipping. That's $5 under our December mention and $32 under the lowest total price we could find for a new unit. It features USB 3.0, WD SmartWare Pro backup software, and password protection. A 6-month Western Digital warranty applies.