I agree with the ticketmania option - as long as you're buying at least three tickets OR picking them up in Kissimmee at ticketmania's pick-up location.
The discount rate is rather small - $2.15 savings on child admission, $3.54 savings on adult, both with taxes included. If you want them mailed to you the minimum charge is $6. So, if you bought two adult, two child tickets and had them mailed to you, you'd save a total of $5.38 from the gate price. If you have a car you could pick them up and save $11.38 but you'd spend an extra 30 - 45 minutes driving down Route 192 and back to get the tickets.
Dick Taylor