Western Digital Red 3TB NAS Internal Hard Drive (4-Pack, 12TB Total) for $399.99 shipped. Here is a screenshot for your reference. It features 3D Active Balance Plus, IntelliPower 64MB cache, SATA 6.0Gb/s interface, and NAS compatibility. Most places have it for about $150 each.
This deal has expired. Congratulations to those able to get in on it.