I don't know how long it takes to get tickets from Undercover Tourist, but that's the only discount vendor I would personally use. We have often bought ours through AAA, which offers a small discount if you're a member.
Do you have school aged children if so there is a great program we always participate in where one of your children attends a program for about 3 hours with an adult, they are educational but also really cool and fun. And you get discounted ticket prices at about half off. If you want more info feel free to PM me
Re: Disney World Tickets
We bought ours through Disney, but I've heard Undercover Tourist is good.
Have fun!
Photo by Melissa Nicole Photography
My mom used Orlando Fun Tickets last year for Universal and we plan on using them again this year. Looks like they have Disney discounts, too.
https://www.orlandofuntickets.com
Latest Blog Update: Peanut Butter Cookie with Salted Peanut Caramel