B&H Photo-Video offers the OWC 8TB RAID Mercury Elite Pro Dual Thunderbolt External Hard Drive Array, model no. OWMETB7DK0K1, for $557 with free shipping. That's the lowest total price we could find by $41. Features include dual Thunderbolt ports, USB 3.0, up to 8TB storage capacity (2 x 4TB), and compatibility with Windows, Mac, and Linux. Deal ends January 25.