Like many others, I do use them for PG/VG for DIY. "Sold by Essential Depot and fulfilled by Amazon," I'm pretty sure I'm getting the "authentic" stuff. I don't have Prime, but it still ships free on orders over $50. So either I wait, until I need enough to make it worthwhile, or else I use it as an excuse to get some of those "add-on" items I didn't really need...