Here is our problem, we have a party of eight. Four of us just need four day park hoppers so that is easy, the military tics cover them. Three others need six day hoppers and one needs a five day hopper. Can I pay to add days on to my last two military tics and just buy the five day hopper out of pocket? Would it be cheaper to get the five day hopper at the Disney Store before we leave? Tks!!