Hitachi Deskstar 7K3000 1.5TB 7200RPM Internal Hard Drive for $54.99 shipped after coupon code EMCKBKA22.  Here is a screenshot for your reference.  It features 7200RPM spinning speed for better performance than 5400rpm hard drives, 64MB Cache and 6Gb/s SATA interface. Most places have it for about $76 or more.