System Memory at Buy.com

I need a system memory pretty soon, my computer is getting slow, the performance is just not like before in some reason. I know upgrading the memory of my PC it will improve the speed and so as the performance. And I found the store where I can find the latest and greatest from top manufacturers such as Crucial, Corsair, OCZ, PNY and more and that is Buy.com. Most of my electronics gadgets I bought from because they always have great prices!