Other World Computing offers its OWC Mercury Elite Pro RAID 2-Bay FireWire 800 / eSATA / USB 2.0 Hard Drive Enclosure, model no. MEPQ936AL2, for $59 plus about $10 for shipping. That's the lowest total price we could find for such a hard drive enclosure by $11. It features FireWire 800, FireWire 400, eSATA, and USB connectivity, support for up to two 3.5" Serial ATA hard drives of up to 3TB each, 64MB buffer, all connecting cables, and more.