Memory buying help please

I am looking to expand my 1gb ram.
I need DDR2 up to 6400 unbuffered NON EEC 1.8v.
I have 4 slots in total and my mobo will take up to 4gb.
The ‘Tech Guys’ at PC World say i cant buy that kind of ram on the high street!
Any suggestions on where to buy would be more than welcome:)

I think that is 240 pin;; check here:
Discount Computer Memory, kingston Memory, Cheap Memory, Notebook Computer Memory, Geeks.com

Hi, thanks for the reply.

I tried the link you posted and realised that i didn’t mention the fact that i’m in the UK!:doh:
Anyway, i tried the ‘shopping uk’ tab at the top of the page and found some great deals there!

One more thing though. As i intend to add more RAM to my pc, do you think its better to go for the modules with heatsinks fitted or are they just a gimmick? I’ll have four modules instead of two so theres gonna be more heat. The stock fans fitted are pretty good but i dont want to overheat anything if i can help it!

Thanks again.