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Steam is running an Activision Publisher Weekend Sale. Activision titles are on sale for 25% off and there are daily deals that are at an even deeper discount. The sale runs from 9/12 – 9/16.
The daily deals for 9/12 are:
Prototype $6.79
Prototype 2 $13.59
There’s also a Call of Duty Black Ops II free weekend going on. Play the game for free (multiplayer only) until Sunday. It looks like the game is only on sale for $45 (25% off).