I wanted to share what I've recently learned about obtaining PG locally, at least here in Arkansas where I live.
I called several farm supply stores in my area and none of them had PG. I never thought to ask about special ordering, but one store offered. I'll pick up a gallon of USP PG in two days for about $24 plus tax. Apparently they get it easily from their veterinarian supply vendor, so they put my order on their next delivery.
Prior to that I contacted a compounding pharmacy. I explained precisely what I intended to do, and made sure to mention that the goal was to avoid nicotine entirely. They refused, but sent me the following email explaining why (which I found to be rather thoughtful of them.)
I called several farm supply stores in my area and none of them had PG. I never thought to ask about special ordering, but one store offered. I'll pick up a gallon of USP PG in two days for about $24 plus tax. Apparently they get it easily from their veterinarian supply vendor, so they put my order on their next delivery.
Prior to that I contacted a compounding pharmacy. I explained precisely what I intended to do, and made sure to mention that the goal was to avoid nicotine entirely. They refused, but sent me the following email explaining why (which I found to be rather thoughtful of them.)
Unfortunately we are not allowed to sell bulk USP-grade chemicals without a prescription. Due to the hazardous nature of propylene glycol, our liability insurance will not permit us to sell that as a bulk chemical. I think an alternate source, like a farm supply store, would be your best option. Please remember that propylene glycol is toxic to animals and children, even in very small quantities, so you should use the utmost caution for use and storage.