B&H Photo-Video offers the Western Digital 4TB World Edition II Gigabit Ethernet Network Attached Storage External Hard Drive, model no. WDH2Q40000N, for $269 with free shipping ($0.07/GB). (Click through to B&H to see this price.) That's the lowest total price we could find by $31, although we saw it for $10 less last summer. This system features two 2TB drives, capacity gauge, and RAID/JBOD support. Although formatted for Macs, it can easily be reformatted for a PC. Deal ends February 23.

A close price: J&R charges a buck more.