It's not really a secret - you just have to be very diligent about checking for discounts. Check right away when a discount comes out to see if it includes POFQ. If it does, jump on it right away because the rooms never last long. Also, check sites like Expedia or Orbitz to see if they are matching the sale rates - sometimes they have a promotion that you can stack on top of Disney's sale rate, making your discount even better. If POFQ isn't included in a Disney promotion, it's still a good idea to check the third party sites to see if you can get a deal. The good discounts typically don't just fall in your lap - you have to look for them. I find online to be better than calling, but since the inventory doesn't always match between the two, it's better to try both.
I don't think AAA is offering Disney resort discounts anymore - I believe that was discontinued the first of the year.