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Steam has the DLC for the Free To Play title DCS World on sale for 70-80% off for 9/9/13.
DCS: UH-1H Huey $10
DCS: A-10C Warthog – DLC $12
DCS: P-51D Mustang $12
DCS: Combined Arms $9
DCS: Black Shark 2 $12
Su-25: DCS Flaming Cliffs $4.49
A-10A: DCS Flaming Cliffs $4.49