4GB memory stick PRO Duo, $119.99 shipped (no rebates).

If anyone is wanting to upgrade to a 4GB memory stick, this is the cheapest I have seen in a while. It's Sandisk brand (not a crappy 'gaming edition') and ships free for $120 with no rebates needed.
[HERE]

http://ec1.images-amazon.com/images/...V64912579_.jpg

Thats to expensive. I know a lot of people dont trust ebay sellers , but i have bought 3 total 4 gb just like the one in the pic for 80 usd and recieved them all and havent had any problems.