Just went to one of my local Lego Stores yesterday (Schaumburg, IL) and they were only allowing one polybag per purchase, even if your purchase qualified for both.
Luckily, the cashier rang up my items incorrectly and had to redo the entire sale, which made him feel bad enough to give me both polybags, so I lucked out.
Just wanted to give a heads up if you are planning on going to a Lego Store for this promo, as your mileage may vary. Maybe call the store ahead of time and ask if you can get both polybags or not. If not, order online through [email protected]