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A Gal Friday is an assistant. I think the original Friday was a man and was the assistant to Robinson Caruso.
I'm not sure about the US but I did see it in Safeway in Canada so maybe try there?!
http://winningcolours.com/store-locator
It has had its name changed.
It is now 1000+ Stain remover by Winning Colours.
gal. Example: 1 gal milk
Neither. 2 gal 8 pt = 3 gal