Cheaper than the DOTD from eBuyer is the Iomega 500gb USB External Hard drive for just £77.39 after the £10 Google rebate. According to one reviewer the drives inside are Seagate so top quality kit! 197 in stock at time of posting.
What You Get
* Iomega® 500 GB 3.5" USB 2.0 Hard Drive
* USB Cable
* Power Supply
* Quick Installation Guide