Cowboom, a Best Buy affiliate, is selling a brand new¬†Western Digital My Book Thunderbolt Duo 4TB External Raid Hard Drive for $350 with free shipping. That’s a total savings of 42% off the list price and $90 below the next lowest price. As a further price comparison, Newegg is charging full MSRP at $600.

Thunderbolt technology provides unparalleled transfer speeds up to 10 Gb/s with the ability to be daisy chained with other Thunderbolt-enabled devices. For even more performance you can opt to setup this system as RAID 0 for speed or RAID 1 for data protection. This particular My Book even has user-replaceable drives to minimize potential downtime and increase storage flexibility. Amazon reviewers rate it four out of five stars.

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WD My Book Thunderbolt Duo 4TB External Hard Driv