@nick
For general PC stuff, get yourself down to your newsagent and get Micromart (a whole £1.60!!). You'll get a good idea of the prices that are being charged. Oh, and it's got an Amiga column.:-D
Computer fairs _can_ offer bargains, but if you have a guide to go on, you know if your getting a bargain or not.
I'm investing in a new PC setup next week and to give you an idea here's what I'm paying:
MSI KT3 Ultra2 M/board £69.33
Athlon XP1800+ £55.23
265MB DDR RAM £44..08
All inc VAT. In my local shop, this would be in excess of £250. The above is from Microdirect, who myself and many others have used before, as they do a 64MB Simms for £15+VAT - bargain!
If it's Amiga stuff you want, then, as has been posted, Amibench or ebay.
Pricewatchmicrodirectshould give you a rough idea as to what you should end up paying for PC stuff.
-john