Related to your question...many WDW guests are unaware that they are not allowed to bring aerosol cans into the parks. I have seen a number of people have aerosol sprays confiscated by security. I wonder, though, if new security procedures may have changed that.
There is nothing quite like the experience of having to buy a necessity at one of the Disney stores, at about 3x the cost of what you would pay off-property. One time, sunscreen was left behind in our hotel room; the price for it at the Emporium produced sticker shock!