Western Digital offers its factory-refurbished Western Digital My Book Live Duo 8TB NAS, model no. WDBVHT0080JCH-NESN for $269.99 with free shipping. That's $110 under the lowest total price we could find for a new unit. It features two 4TB hard drives, an 800MHz processor, RAID 1 mirroring, and USB 2.0 and Ethernet ports. A 6-month Western Digital warranty applies. Deal ends June 30.