B&H Photo Video offers the Western Digital 8TB My Book Thunderbolt Duo External Hard Drive, model no. WDBUTV0080JSL-NESN, for $479 with free shipping. That's the lowest total price we could find by $71. It features two Thunderbolt ports and is configurable for maximum speed (RAID 0), data protection/mirror mode (RAID 1), or individually in JBOD mode. Deal ends January 27.