Left 4 Dead 2-styled Hunter and Tank plushies are now available through the Valve store, where they are 10 percent off for a limited time.
Unfortunately, they won't be delivered in time for Christmas, if you're looking for a last minute idea. They're scheduled to ship Dec. 27. Both require 3 AAA batteries and include 10 sound samples from Left 4 Dead 2. The Hunter is $26.95, the Tank is $31.45. (Those are the discounted prices).