If you're booking room-only you can call WDW reservations directly and ask for the AAA rate, you don't have to go through AAA (we've done this several times). However, if WDW reservations tells you that no rooms are available at the AAA rate (they limit the number of AAA discount rooms), your local AAA office might be able to book a discounted room for you. Whichever way you do it, be sure to have your AAA card with you when you check in.