Western Digital WD20EARS Caviar Green 2TB 64MB Cache Internal Hard Drive for $124.99 shipped after code ZZF1049 and a $15 rebate.  Be sure there is no extra space before and after the code for it to work.  Here is a screenshot before the $15 rebate for your reference.  This is part of WD’s GreenPower lineup, which reduces energy usage.  It comes in OEM packaging, which means no pretty retail box but is otherwise identical.  Most places have it for over $170.