Most people will go to big brand name stores like Best Buy or Circuit City to buy hardware, or parts, for their computer. To be honest they are usually very expensive compared to an online wholesaler like NewEgg. NewEgg is a website that caters to people who want cheap computer parts and know how to install them. If your handy with a screwdriver and know where the new part goes (hard drive, RAM, video card etc...) then you should check out NewEgg because their prices are very hard to beat. On the other hand, if you don't know what your doing you can either find someone you know and have them install it, or buy it from one of the big brand name stores and hope that they will install it for free. Chances are that you know someone who can install a hard drive or RAM module, just look around, I'm sure they're there somewhere. Good Luck!