For its newsletter subscribers only, newegg offers the Western Digital My Book 4TB Live Duo NAS, model no. WDBVHT0040JCH-NESN, for $349.99. Coupon code "EMCNJHD57" drops it to $329.99. With free shipping, that's $0.08/GB and the lowest total price we could find by $35. It features two 2TB hard drives, 800MHz processor, RAID 1 mirroring, SATA interface, and more. Coupon expires February 1.