We saved close to $400 for 8 nights for the 5 of us at the Polynesian during Value season in July of this year. The
www.mousesavers.com site has more info on the specifics. Here's the information there:
AAA and CAA Resort Hotel Discounts
American Automobile Association (AAA) and Canadian Automobile Association (CAA) members qualify for "room only" discounts almost year-round, though there are a limited number of rooms available for each date. You can generally save about 10-20% at the Disney resort hotels, depending on the season.
In general, the discounts run as follows:
During Value Season you can get up to 15% off at the Disney Deluxe and Disney Vacation Club resorts, or 20% off at the Value and Moderate resorts and the Ft. Wilderness campsites.
During Regular Season you can usually get up to 10% off at the Disney Deluxe and Disney Vacation Club resorts, or 15% off at the Value and Moderate resorts and the Ft. Wilderness campsites.
During Peak Season and Summer Season you can usually get up to 10% off at the Disney Deluxe and Disney Vacation Club resorts, or 15% off at the Value and Moderate resorts.
The only time AAA/CAA discounts don't usually apply is Holiday Season (around Christmas) at the Value and Moderate resorts.
This is off the hotel portion of whatever you're booking.