Hitachi 0J11563 750GB Laptop Hard Drive for $54.99 shipped after promo code EMCXSXR27.  Here is a screenshot for your reference.  This laptop hard drive features 5400 RPM, 8MB cache, and SATA 3.0Gb/s interface. Note that it comes in OEM packaging, which means no pretty retail box and marketing materials but is otherwise identical.