Is the price for ABD much better at time of release? Does it increase as time goes on? I know for Disney cruises, the prices can go up as the hours go by on opening day! We want to try a ABD and was considering doing it for summer of 2020 but can wait if we should wait to book a trip at time of release (currently debating between Alaska or China). It's for a family of 4 so price differences can add up! Thanks!