I think you can get the standard Mickey ponchos most anywhere in the parks, resorts, etc. Wait for a rain shower and they suddenly appear by the cash registers.
Don't hesitate to ask in the stores if they have something when you don't see it. We were at Epcot and my oldest daughter needed an antacid. I went into one of the stores and looked around and it didn't appear that they had anything other than clothes and souveneirs. One of the workers asked me what I was looking for and he told me that they keep that stuff behind the counter. They opened up a very big drawer full of all kinds of toiletries etc. I guess they just don't want them out taking up space on the shelves. If he hadn't told me I would have just walked out and gone searching for another store.
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