Buy.com has Verbatim 320GB USB Portable Hard Drive for $49.99 + free shipping.
Features
Bus powered – no AC adapter or power cords required Bus powered – no AC adapter or power cords required
Easy-to-use Nero BackItUp 2 Essentials backup software included. Software compatible with Windows operating systems only.
Increase the storage capacity of your laptop or desktop PC
Transfer files between office and home
Store and take music, photos, and video
3-Year Limited Warranty
Tech Specs
System Requirements:
USB 1.1 or 2.0 Port
Windows 2000, XP or Vista
Mac OS 9x, Mac OS X 10.1 or higher
Specifications:
Rotational Speed - 5400 RPM
External Power - USB bus-powered
Interface - One USB Mini-B port
Data Transfer Rate - USB 2.0 High-Speed: 480 Mb/s (max), USB 1.1 Full Speed: 12 Mb/s
Unit Dimensions - 3.38 in. X 5.38 in. X 0.63 in.
Unit Weight - 5.2 oz
Verbatim 320GB USB Portable Hard Drive $49.99 FS 
