Wait a sec ... aren't the promotion codes listed on the original post the same as the PriceGrabber promotion codes, or am I missing a way to get an additional $5 off on this game?
Just used this code today for the deal, so it's still active as of a couple hours ago. You can check if the coupon is active by checking out to the final stage and entering in the coupon code. If it discounts your price, then it's still active.