B&H Photo has the Drobo 4-Bay USB 3.0 Storage Array (3rd Generation), model no. DDR3A21, for $199 (299.00 – 100 instant savings) with Free Shipping for a limited time.

The safe, expandable Drobo storage solution protects your data against a hard drive crash, yet can expand dynamically at any time in just seconds. With nothing to configure or manage, Drobo is now the ideal solution for primary storage as well as backup. This enclosure allows you to manage, protect, and scale storage for your PC or Mac. It accepts up to four 3.5″ SATA HDD drives of differing capacities from different manufacturers. It’s compatible with both Windows and Mac and comes with a USB cable.