Use Priceline for your hotels (unless you are picky about WHERE you will be located).
Eat Breakfast in your room or at your hotels contential breakfast (if available).
If you plan on a sit down meal, do it at lunch its cheaper.
Do not purchase everything you see. Look around and find the one or two things you just can not live without. Remember to take a few notes on where you saw what, so you don't forget. Also World of Disney in Downtown Disney will have the best selection of a variety of things.