bestbuy has the Western Digital My Book 500GB Hard Drive (Essential Edition) on sale for only $200, check other online shops and I bet you won't find a cheaper price. The device uses USB 2.0 and has an interesting feature to see the current storage capacity - the little blue circle can get full/empty depending on how much space is left. Also uses Google software to search and manage files.

The $200 offer expires on the 3rd of September which is tomorrow, so hurry up if you are in need of a big hard drive and have a low budget.

Check the Western Digital My Book 500GB External USB 2.0 Hard Drive at BestBuy