FYI
I was offered a AAA and Disney Club discount on OKW by CRO for October/November (I was checking on rates for a cash ressie for my MIL and SIL)
I guess what I am trying to say is if you call MS and they tell you that no discount is available and you have one of the above programs, make a res through CRO and then keep checking for a member discount.
It doesn't really matter who you go through if you are going to pay cash anyway.
The discount they offered me was over 20% and she said they would also have AP rates available for that time.
Bottom line, sometimes if you are going to pay cash, MS may not always be the way to go.