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Battlefield: Bad Company 2 Vietnam the expansion for Battlefield: Bad Company 2 is on sale as the daily deal on the IGN PC Store for $7.50 which is 50% off the original price of $14.95. However when you apply the 20% off coupon code IGNPCSTORE the game drops to $6. Cheap!
NOTE: This expansion REQUIRES Battlefield: Bad Company 2
EDIT: This does work with the Steam version.
You don’t do it directly on Steam, you do it from inside the game.
Click ‘Vietnam’ in the game.
The first code it asks for, enter your *BF BC 2* code. Then, it’ll ask for the Vietnam code.