I received a mailing from AAA and checked it to see if I could find what you reported here. Alas, as others have posted, the deal they are running is buy 2 days and get a third free.
In the same mailing, it said that if you show your AAA card at selected Universal locations, you can get 10% off dining and shopping. It didnt list what the selected locations are, but AAAs website states that the card is good for a 10% discount on food and merchandise within the Universal Parks. Also, Hard Rock Café gives a 10% to AAA members at all its locations.