L4D 2 will be available as a demo for steam pre-orders ar Haloween, several TGT members are organising to buy it together as a quad pack to save money, visit this thread on our forums to see who's interested:

http://www.thegroupthing.org/forums/viewtopic.php?f=90&t=1011&p=11606#p11606

As always, remember not to post personal financial information on the forums