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In case you missed the previous Steam deal, you can pick up Sid Meier’s Civilization V on sale at Amazon. The game uses Steamworks so you will have to activate it on Steam. Also the game uses Steamplay so you will have access to both the PC and Mac versions using the same activation code.
Also, the Standard Edition of Rift is on sale also. It’s an MMO so keep in mind you’ll have to pay a monthly subscription fee.