Wrong forum, but I'll answer your question.
Try crucial.com and I'm not sure how much you would probably have to pay. Pretty expensive, I would think considering memory is way up there right now. Also, you have to get PC133. If you use PC100, it'll always have a message during bootup that says something like in order for maximum performance, you must use PC133 and I can't remember if it even lets you boot up at all.
-biglaw11