BuyDig offers the Western Digital My Book Live Duo 8TB NAS, model no. WDBVHT0080JCH-NESN, for $549. Coupon code "SAVE100" cuts it to $449. With free shipping, that's $0.06/GB and the lowest total price we could find by $130. It features two 4TB hard drives, 800MHz processor, RAID 1 mirroring, SATA interface, and more.