Western Digital Caviar Green WD20EARX 2TB 64MB Cache SATA Internal Hard Drive for $114.99 after using code EMCNGHC44.  Here is a screenshot for your reference.  6 Gb/s SATA interface, AF (Advanced Format) support, Green Power technology, IntelliPower technology, IntelliSeek function, and NoTouch Ramp Load technology.  Most places have it for about $129.