Lori,
Good tip about adding 30% to the total of everything we think of.
Don't have to concern ourselves with hotel taxes (business trip, so DH's work is picking up the tab on the hotel room and rental car). But under "normal" circumstances I would have forgotten to factor that in probably.
You mention refrigerator rental ... is that available in ALL Disney on-property resorts? We are specifically staying at the Coronado. What does a refrigerator rental typically cost per day? (I'm assuming work won't pay for this little luxury) And how big are the refrigerators?
To save on food expenses I was considering bringing along some nonparishable items like cereal, nuts, jerky, pringles chips (less like to crumble to itty bitty crumbs), etc. If we can get a small refrigerator in the room to stock up on juice, milk, bottled water, and sodas that would help save a bit more money too (at least, I think).