B&H Photo-Video offers the Drobo 4-Bay USB 3.0 Storage Array, model no. DDR3A21, for $199 with free shipping. That's $31 under our January mention, the best price we've seen, and the lowest total price we could find now by $70. This enclosure can support up to four SATA hard drives or solid state drives for a maximum capacity of 24TB. It features BeyondRAID technology, which chooses the correct protection algorithm based on data availability needs and allows switching from single to dual disk redundancy with a single click. It's compatible with both Windows and Mac and comes with a USB cable.