newegg offers the CineRAID 4-Bay USB 3.0 eSATA RAID Subsystem, model no. CR-H458, for $139.99 with free shipping. That's the lowest total price we could find by $87. (For further comparison, we saw it bundled with a controller card for $20 more last month.) It houses up to four 3.5" drives and features a RAID controller that supports RAID 0, 1.10, 3, and 5.