Seagate ST2000DL003 Barracuda Green 2TB 3.5″ Internal Hard Drive for $109.99 shipped. Here is a screenshot for your reference. Alternatively, it is available at Newegg for the same price shipped after coupon code as shown here. Note that it comes in OEM packaging, which means no pretty retail box and marketing materials but is otherwise identical. It features 5900 rpm speed, 64MB cache, SATA 6Gb/s interface, and more. Most places have it for about $125.