Seagate Barracuda Green ST1500DL003 1.5TB Internal Hard Drive for $69.97 after using this $30 rebate.  Shipping is $2.99 for a total of $72.96 shipped.  Here is a screenshot before the $30 rebate for your reference.  It features 5900 RPM, 64MB cache, and SATA 6Gb/s interface.  Most places have this internal hard drive for about $99.