CompuVest.com has the Western Digital Caviar SE16 750GB hard drive (model no. WD7500AAKS) for $66.99, which is $183 off the MSRP of $249.99 and the lowest price we have seen on this hard drive by about $11.  Shipping rates start at $9.99 and vary by method of delivery.  Sales tax applies for residents of Washington.

The Seagate DB35 series 750GB hard drive is priced at $119.99 with $12 for shipping at CDW.com.

NextWarehouse.com has the 250GB Seagate Momentus hard drive for $66.83 with FREE shipping.

The Western Digital Caviar SE16 has a storage capacity of 720GB with data transfer rates of 972Mbps maximum internal or 300Mbps maximum external with a rotational speed of 7200RPM.  Interface ports include one 7-pin serial ATA.  Dimensions: (H) 1.03" x (W) 4" x (D) 5.79" ; weight 1.39lbs.