Scan have the Seagate 500Gb 7200.10 perpendicular recording SATA II drive for the princely sum of £86.36 + postage (not sure how much postage costs are)

Can't give you a direct link but if you look here and page down it should be there, offers only till 12 tomorrow afternoon by the way.

http://www.scan.co.uk/todayonly/

If you're a Hexus regular then you can get the drive with free shipping too so an even better bargain me thinks.

Check for discount codes to use at www.scan.co.uk