Fry's Electronics offers the Western Digital 2TB My Book Duo Thunderbolt External Hard Drive, model no. WDBUWZ0020JBK-NESN, for $299.99 with free shipping. That's the lowest total price we could find by $19, although most sellers charge $400 or more. It features two 10,000 rpm WD VelociRaptor drives, 10Gb/s transfer speeds, dual Thunderbolt ports, and RAID 0, 1, JBOD support.

Update: It's now available for in-store pickup only.