My parents will be joining us down in Disney this weekend--they are only going to be there for the day---wheres the best place to buy the one day passes? should they just get them at the gate or should I go over to the Disney store and buy them before they arrive? What is the cost of these? She said something about going to a timeshare and getting passes--but I do not want them going that route if it can be helped---any help is appreciated!!!