You can buy USP grade PG at a farm supply store like Southern Agriculture or Tractor Supply stores. But you have to buy it by the gallon....about $35 for a gallon. I have done that twice now. It says USP grade right on it....it's used to treat cattle for ketosis. (???) Also, I buy USP grade VG at Walmart, CVS pharmacies, Atkins health food stores...etc. The quantities for the VG are much smaller.....6 oz - 16 oz. Atkins is the cheapest at $8 for 16 ounces.
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