B&H Photo-Video offers the Western Digital 4TB World Edition II Gigabit Ethernet Network Attached Storage External Hard Drive in White, model no. WDH2NC40000N, for $259 with free shipping ($0.06/GB). That's the lowest total price we could find by $70. This system features two 2TB drives, capacity gauge, and RAID/JBOD support. Although formatted for Macs, it can easily be reformatted for a PC.

Updated: Specs have been corrected. We apologize for the error.