Western Digital Scorpio Black WD5000BPKT 500GB Laptop Hard Drive for $59.99 shipped after promo code EMCXVVP29. Here is a screenshot for your reference. It features 7200 RPM, 16MB cache, and uses SATA 3.0Gb/s interface. Note that it comes in OEM packaging, which means no pretty retail box but is otherwise identical. Most places have it for about $66.