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This is for a Steam code and contains all the DLCs. I think this is the lowest the game has been. It is also eligible for Playfire rewards until the end of Thursday if you have time to spare.
Edit: The deal has expired. I myself have installed and tried the game. As mentioned, the game is very demanding, but disabling PhysX can triple the fps is some areas, like the battle during the benchmark, or the starting base. The unskippable intro logo is annoying, and if you are sensitive to motion sickness, beware: Metro LL has a low FOV (you can up it in a text file), motion blur when looking around (you can only reduce and not disable it) and head bob. Metro LL is as bad as Dead Island.
This is a great game. I also suggest playing the STALKER series as well (Shadow of Chernobyl, skip Clear Sky, Call of Pripyat) if you like open world exploration, side quests and Deus-ex style gameplay.