Samsung EcoGreen F2 HD103SI 1TB SATA Internal Hard Drive for $47.99 shipped after promo code EMCYTZT432. Here is a screenshot for reference. This 5400RPM drive is 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 about $56.