KRAY and many others just don't want the BBS gummed up with repetive stuff. I found the answers to all the questions that you asked by searching when I was a WP newbie and it is amazing how much you can learn by going through the search process and reading the threads that come up.
That being said, I got my 128Kb meomory for just over $30 (after rebate) at Best Buys. It is an 8 chip SODIMM by PNY. There is a link to a mail order place somewhere in one of the threads that is a little cheaper but I am not positive that it is compatible.
Tennmax (they have advert banners/links on the BBS from time to time)makes the Lasagne fan for the CPU.
Check out Kray's site for lots of good technical information on the WebPlayer.
Regards and sorry for gumming up the BBS,