Looking for a last minute stocking stuffer this holiday season? Valve is offering Left 4 Dead posters based on each of the "movies" in the popular co-op shooter. For those unfamiliar, Left 4 Dead's four levels are based on zombie movie plots each with a different name and setting. Posters for the in-game movies Death Toll, Dead Air, Blood Harvest and No Mercy are all available for $6.99 each or as a set of four for $14.99. Not a bad idea to dress up those walls this holiday season.