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SF Brewcraft on 17th & Clement reliably has citric acid powder, because it's used in cider making. Other brewing stores probably carry it as well. http://www.sanfranciscobrewcraft.com/
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re: Cynthia
Sorry I can't be more helpful, but the European grocery store talked about above at 32nd and Clement does carry citric acid, also the Russian grocery store at Geary and 23rd (I think - 21st through 24th somewhere). Can't remember its name for the life of me, but definately a great place to browse for stuff not available elsewhere.
More generally, searching in the outer Richmond has resulted in my favorite finds recently: the peroskis, cloudberry jams (wow!), aquavits, cured meats . . . Lots of Eastern European stuff that cannot be found elsewhere in the city (except at that place in Berkley - House of Norway?) As you can see, not a good chowhound, only remember the food, not the names of the places I got it.
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