Western Digital offers its factory-refurbished Western Digital My Cloud Mirror 4TB Personal Cloud Storage Gigabit Ethernet NAS, model no. WDBZVM0040JWT-NESN, for $209.99 with free shipping. That's $90 under our refurb mention from last summer and the lowest total price we've seen. (It's currently $50 below the best price we could find for a new unit.) It features two USB 3.0 ports, iTunes compatibility, and dual-drive storage with an optional mirror mode. A 6-month Western Digital warranty applies.