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You might be able to score some gypsum or calcium chloride elsewhere. Don't know if you'd be able to get pure or food grade stuff. Some rudimentary googling shows garden gypsum easy to find, but I'm guessing there's a bunch of other stuff in there too you don't want in your beer.
You could also get epsom salt easily at a pharmacy, but to drop a pH that much you'd need so much it'd probably have a bunch of unwanted consequences.
I have gypsum and calcium chloride, which are both being added to mash and sparge water.