I buy my VG and PG from there for making DIY juices.
http://www.amazon.com/Glycerin-Vegetable-Kosher-USP-Gallon/dp/B00PSGWHIO/
Nic river is cheap, haven't used it but have heard only good things. I use essential depot, if you buy direct from them you can get pretty good discounts on a couple gallons.
I buy my pg and vg from amazon. Been doing it for years. This is what I get