If you can book now, I would. Just let the
travel agent know that you want to change it if their is a discount. I have used some of the disount travel agents that were recommend here. They were great. or you can use
AAA.
Yes it is very hot in September, but the crowds are less.
A bounce back is when you are at the parks....
and I do mean at the parks, because they will not offer it to you once you have checked out. Some people received a card in their room with a great offer. Go to where they book travel (at the front desk area). And they offer you the same program for the following year. I believe that you have to leave a deposit.
Good Luck!!!!