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source for KH2PO4

Is there a ready source for KH2PO4?  Do you use one of those pH buffers, and if so, which one?  (Is the Discus Buffer made of this?).  Many pH buffers tout "no phosphates" nowadays.  Or, do you buy the straight chemical from some supply place?  I live in Davis, California, if that helps.
Roxanne Bittman