Square Enix is offering a deal on Deus Ex: Human Revolution Director's Cut for those who have previously purchased the game on Steam. The Director's Cut will include the main game, along with all three pieces of DLC.
Those who own the base game and The Missing Link DLC need only to pay $4.99 for the upgrade. Those who own only the base game will have to pay $9.99. (The game in its entirety is $19.99.)