This is where I got mine. It only cost $9.99 for my PS2 chip. I bought the no soder one. You should make sure you get the one that goes with your version of PS. I got my package in about 3-5 days. Installation was pretty easy but the pictures to go by on the site sucked I thought. Anyways, happy gaming.
http://www.hexcorp.com/pages/ps2.htm