Western Digital Caviar Green 800GB 64MB Cache SATA Hard Drive for $59.99 shipped. Here is a screenshot for your reference. Alternatively, it is available at Amazon for the same price shipped as shown here. This is part of WD’s GreenPower lineup, which reduces energy consumption. Note that it comes in OEM packaging, which means no pretty retail box and marketing materials but is otherwise identical. Most places have it for about $69 or more.