http://www.mackcam.com/warranty.html
I am pretty sure you can get it regardless of who you buy it from, its a panasonic approved extended warranty. You should call them to be sure. Worst case I can give you the info for the store I bought my 700u from (located in NJ I believe) There the best people to deal with and they even cod if its in your favor.
No experience with the ps2 yet since I am still working on the room nothing is permanently mounted yet.
Good luck, and trust me there is no way you will be disappointed.
You can extend the warranty any time I thik as long as you do not let it run out. Be sure you check on thet though I thnk I only got a 1 year parts and 90 day lamp??