A dealmac exclusive! Oyen Digital offers the DataTale SMART 4-Bay Serial ATA Hard Drive Enclosure, model no. RS-M4T/C, for $539.95 plus about $11 for shipping. That's the lowest total price we could find for any 4-bay Thunderbolt enclosure by $89. It features aluminum construction, support for SATA and SSD drives (up to 6Gbps), Thunderbolt connectivity, JBOD (non-RAID), RAID 0, RAID 1, RAID 10, and HyperDuo backup, and more. Deal ends May 22.

Update: It's now available with free shipping.