The discount will range from 10% to 20% off the rack rate depending upon the season and the level of the hotel (value, moderate or deluxe).
The 10% discount is mostly for deluxe and home-away-from-home resorts for the regular and peak seasons. Values and moderates get 15% off during those seasons.
In Value season, the deluxe and home-away-from-home resorts offer a 15% discount while the values and moderates offer 20% off the rack rate. It is interesting to note that the "Value Season" for all resorts is not the same.
The AAA rates have been out for a while now. We're booked at the Poly Concierge Lagoon View for next August at the AAA rate. I saves me a nice chunk of change.