Last year AP rates were roughly 40% off rack rate.
This year it is dollars off based on the resort type and season.
AAA is 10-20% based on resort type and season. From mousesavers,
During Value Season you can get up to 15% off at the Disney Deluxe and Home-Away-From-Home 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 Home-Away-From-Home resorts, or 15% off at the Value and Moderate resorts and the Ft. Wilderness campsites.
During Peak Season you can usually get up to 10% off at the Disney Deluxe and Home-Away-From-Home resorts, or 15% off at the Value and Moderate resorts
I think I read somewhere that the differential for the value resorts (15-20% off of rack) for some times of the year is relatively small.