Left 4 Dead is on offer over at Steam again. You can get it this week for £12.49 (around or less than $20). This is an ideal time to join us in one of our giveawayoftheday zombie smashers parties. L4D is one of my favorite games at the moment. If you do buy it let us know vi this thread and I'll set up a date for a cooperative meet. :)
WR
There's quite a few extra custom maps been released since it's release last year. And theres just been anew mode released thats added to the game free if you buy it via Steam.