[commiebob]

http://www.crucial.com/ is probably a good place to start, select your system from the drop downs and it will give you the exact type of memory you need - and for a decent price. There might be cheaper options if you hunt around, just get the dimm size from crucial and google around to compare prices.

[iohnuiob]

Buy from crucial, when you factor in their free shipping they are cheaper than most half decent brands. You might find some super-bargain RAM cheaper if you don't care about whats stored in it.

Crucial also have excellent service for returns or if the stuff doesn't fit.