1) If you know what you want, buy them ahead of time and save a few bucks.
2) If you need help, then buy them at the Concierge Desk.
3) Let's face it, there are a lot of ticket options to consider
. . . number of days for ticket
. . . park-hop or no park-hop
. . . water parks or no water parks, and how to blend with park admissions
. . . expire or non-expire