B&H has the WD 2TB My Book VelociRaptor Duo Thunderbolt RAID 0 hard drive for $339 (reg. $669) through May 30, 2015. The VelociRaptor Duo delivers impressive speeds up to 400MB/s when in RAID 0 thanks to the 10,000RPM drives inside. I averaged around 350MB/s when using the drive in my tests. Check it out here at B&H Photo.