Buy.com offers the Verbatim 500gb USB 2.0 7200 RPM External Hard Drive for just $79.49, which is quite the price drop from the $211.19 regular price. 
Other drives to consider: 
1. Calvary 500gb External at $79. 
2. Fantom Drives External at $64

Buy.com offers the
Cavalry 500GB USB 2.0 7200RPM External Hard Drive for $79. That’s a savings of $65.91 from the regular price of $145.90. Free Shipping on this too. A great way to store all your music, movies, and photos.
Buy.com also offers the
500gb External Hard Drive for $64. we listed yesterday, but this item is refurbished. [...]