We will be going to Disney in early November....and I'm thinking of taking my 9 year old to discovery cove for the Dayton do the dolphin swim. I'm just not 100 percent sure yet....since our Disney trip will be very expensive...8 nights at AKL...if I want to do this or not. But I don't want to wait tooo long and not be able to get tickets. How far out do these usually sell out? Ty!