Shopping for PC stuff is both a lot cheaper and offers better customer support than shops like PC world. However always check delivery charges
 

Computer Prices Tells you the cheapest place to buy PC Stuff Online. A must, Brilliant
Micro Anvika Computers
Empire Direct	.  Don't buy Hi-Fi stuff till you've been here
Dixons Online. Not a great shop, but a big name.	Ask Electronics Direct from Tottenham Court Rd