I stayed in Maui for a couple of weeks and didn't notice too much of a difference in prices there versus here in Austin. A few cents here, 10 cents there, but not a whole lot of difference price wise in the normal big stores. Gas wasn't that bad either, but that was a couple of years ago. You can price check everything from your laptop if you need to, just put in the ZIP and whatever you want to get. That's how we budgeted before we went.
Attitudes are contagious. Mine might kill you