I just bought 1G of new RAM for my home computer from memorygiant.com. The website is easy to use and they guarantee to send you compatible memory for your computer. Shipping is free and the prices are better than I've seen anywhere for top-quality electronics. They even offer step-by-step instructions for installation. I received the package within days (they promise same-day ship out) and I am nothing but satisfied with my experience.
A little RAM will make your computer run much faster, and it doesn't cost that much. Go on. Memory Giant makes it so easy!