Samsung EcoGreen F2 HD103SI 1TB SATA Internal Hard Drive for $64.99 shipped. Here is a screenshot, along with more information for reference. This is a 5400RPM drive designed to be energy-efficient instead of maximum speed, which makes it a more appropriate storage drive than a boot drive. Note that it comes in OEM packaging, which means no pretty retail box but is otherwise identical. Most places have it for over $85.