Here's some good sites for price comparisions:
http://www.pcindex.co.uk/
http://www.pricewatch.co.uk/
http://www.micropricecheck.co.uk/
For supplies in USA try:
http://www.necx.com/ Seem to be really good prices. (I've been comparing hard drives recently.)
http://www.ecost.com/ ecost expect to trade to Europe sometime early 2000.
Speaking of comparing hard drives try:
http://www.storagereview.com/
Hope that helps.
Regards,
h_k