Got an email from Drobo.
Gen3 for $229 until 5am on 1/14
http://www.ebay.com/itm/Drobo-4-Bay-3-Gen-3-5-SATA-SSD-Enclosure-USB-3-0-Ethernet-RAID-DDR3A21/371232669555?pt=US_Drive_Enclosures_Docks&hash=item566f30ff73