Like 70_challenger said, the prices are pretty much set. There may be slightly lower prices from like kisseme guest services but unless you go do a time share presentation you won't find huge discounts. Like mentioned, AAA has some combo packages that's dependent on your area.
How long are you going for? How old are the kids? It might be an idea to pick up a book from a book store about Disney, There are books that tell about the rides, when to go, how tall you have to be, etc.... This is nice to plan out stuff so you're sort of "pin pointed" as to what to see as it can be overwhelming with all the attractions.
We had a plan and stuck with it and saw the stuff we wanted to see most because it's tough to see it all in a short time period.
One way we saved:
You would be surprised how "cheap" it was to get passes for a longer time period. We were just going to go to the 4 parks: Magic Kingdom, Epcot, MGM, and Animal Kingdom. It was me, the wife, and 3 kids. We were just going to do a 4 day pass but for like $30 more total (Not $30 per person) we got a 7 day pass. That way we didn't feel as rushed and could come back another day to finish up the stuff we didn't get to see. This was really helpful with 3 little kids as they got tired easy.
We just went to Disney World in the beginning of May and it was fantastic! We had hardly any wait in line for rides. I would say 5-10 minutes on average. Some rides we got off and got right back on. It helped that we were able to hit the parks on the weekdays but the weekends weren't bad at all either.
Don't forget to ride Test Track at Epcot and see Lights, Motors, Action at the Disney MGM studios!
The turkey legs were fantastic!