Seagate 500 GB External Hard Drive.
Available at Newegg.com On sale for $149.95

http://www.newegg.com/Product/Product.aspx?Item=N82E16822148172

Seagate 500 GB External Pushbutton USB 2.0 External Hard Drive 16 MB Cache. Live large, store small. These drives are beautifully engineered, inside and out, with state-of-the-art features and work-of-art design. They’re exceptionally durable, conveniently portable and perfectly stackable. This compact, durable drive is ideal for all your business and personal storage needs. You can easily protect and access everything from multimedia presentations and digital photos to MPEG video and DVDs with back up with the touch of a button. Award-winning BounceBack Express software from CMS backs up faster and easier than any other method.

Model # ST3500642U2-RK

Technical Details:

Push button operation and BounceBack Express software makes it fast and easy to back up data.

High-performance 7200 RPM drive with 16 MB cache and USB 2.0 interface.

On/off button eliminates concerns that your hard drive hasn’t been shut down safely.

Built-in self-monitoring technology continuously checks your hard drive for data safety and drive performance.

Hot-swappable, so you can connect and disconnect without turning off
your computer.

And did I mention its only $149.95. Get one while there still in stock.