I am a pass holder to Disneyland for many years and I completely understand how expensive it is to visit a Disney park for a family these days. Visiting in the summer months can cost more than going on a vacation in the fall for example as off season rates are much less.
I would suggest in terms of budgeting for a trip to Florida would be to check Disney blogs that offer hidden rates that are not offered on the regular Disney corporate site. You can inquire about rates and dates to travel as prices will vary on when you wish to travel:
1. Start by looking at the site "MouseSavers" which offers plans for 2016 from such companies as SouthWest Airlines:
2. Membership to stores such as Costco offer very low rates:
3. Offices in Illinois and have package deals: