Western Digital Caviar Green WD20EARX 2TB Internal Hard Drive for $89.99 shipped.  Here is a screenshot for your reference.  Alternatively, it is available at Amazon for $89.99 shipped. It features 64MB cache, IntelliPower and 6 Gb/s SATA interface, AF (Advanced Format) support, and NoTouch Ramp Load technology.  Most places have it for about $104.