I have a couple sitting around as spares but they are as cheap as chips again now. Not worth the hassle of posting.
http://www.overclockers.co.uk/showpr...odid=HD-364-WD
£44 and free postage if you join the forum.
Expect other places will do just as cheap
If you want it quick PC World/Currys have them for £59 or 69 for 1T or £79 for 2T
My advice get a SSD and 3.5 inch converter bracket.