This weekend: Left 4 Dead 50% off on Steam

For this weekend only, Valve is offering Left 4 Dead for half-price via Steam. So now, like everyone else with a pulse (seriously, no zombies allowed!), you can get with the program and start playing this game zombie apocalypse training simulator. The cost of civic duty entry: $24.99. In other words, a steal. And it's only going to get better when the free DLC hits.

This article was originally published on Joystiq.