This Hard Drive

OfficeDepot.com has the Seagate FreeAgent ST305004FDA1E1RK 7200rpm 500GB USB 2.0 External Hard Drive With 8MB Buffer Cache for only $109.99 with free shipping.

Product description from OfficeDepot.com:

• Easy-to-use, high capacity external 3.5" USB 2.0 hard drive lets you back up your digital photos, videos, music and other valuable files, or simply add additional storage capacity.
• Compact drive takes up little desk space. Dimensions: 7 1/2"H x !
  3 1/5"W x 6 2/5"D including the stand.
• Drive features a cool-running, whisper-quiet motor with a 7200-rpm rotational speed.
• Plug and play! Just plug in the power, connect to your PC or Mac via the included USB 2.0 cable, and you’re ready to go!
• Compatible with Windows 98SE/2000/XP/Vista, Mac OS X 10.3.9 and later (PowerPC G3, G4 or G5), Mac OS X 10.4.6 and later (Intel Core Duo, Core Solo).
• Backed by the manufacturer’s 5-year limited warranty.

Product link.