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Lead and Gold is available for free play as a Free Steam Weekend deal. This is another Paradox Game. The guys that brought Magicka to the masses. This is a great chance to try out the game if anything.
The game is also marked down 75% off which makes it a super low $2.50.
A four pack is available for $7.49 which basically means you get a free copy of the game.
Lead and Gold: Gangs of the Wild West – $2.50
EDIT: This game is also available on GamersGate for $2.48. The nice thing is you get blue coins which you can use towards future purchases.