If you want cheaper and it's out of sight like mine you can get this HDD 5 disk rack for $20. It doesn't hide the wires, but keeps the drives cool. I have them in my basement in a corner where I hardly venture too. I have 2 of them for adding an additional 10 drives and have the wires coming out of my regular case's pci slots. Not the prettiest sight, but not bad if hidden away.
SANS DIGITAL HDDRACK5 http://www.mwave.com/mwave/SkuSearch_v2.asp?SCriteria=BA24977