Western Digital Caviar Blue 500GB SATA 6.0Gb/s HDD $35 at Newegg

Newegg has the Western Digital Caviar Blue WD5000AAKX 500GB SATA 6.0Gb/s Hard Drive for $45 - $10 off with coupon code MEMORIALWKND [Exp 5/31] = $35 with free shipping. Features a 7200rpm rotational speed, 16MB cache, and a SATA 6.0Gb/s interface.

WD Caviar SE16 500GB SATA 3.0Gb/s Hard Drive for $45 - $8 off w/ code EMCKEHF27 [Exp 5/30] = $37 with free shipping