Other World Computing offers the open-box Buffalo Mini Thunderbolt 512GB Dual-SSD DriveStation for Mac, model no. SSDWA512T, for $375 with free shipping. That's $105 under the lowest total price we could find for a new unit. It features two RAID-enabled SSDs, dual 10Gb/s Thunderbolt ports, and transfer speeds of up to 763MB/s. A 3-year Buffalo warranty applies.