WD Caviar Green 1.5TB 32MB Cache SATA Hard Drive for $104.99 shipped.  Here is a screenshot for your reference.  Alternatively, it is available at Newegg for the same price shipped.  This is part of WD’s GreenPower lineup, which reduces energy usage.  Note that it comes in OEM packaging, which means no pretty retail box and marketing materials but is otherwise identical.  Most places have this 1.5TB SATA drive for over $120.