Well I know what you mean here is what I know, vg can be gotten at a health food store,like Drug emporium and is 100 % pure, Wal Mart has 99.5 % pure in the bandaid section made by Humco.
Pg Can be had at TSC store ( Tractor Supply) a farm store but they normally dont stock it Order only( imfo from my farm days as a kid), I am not sure if it is 100% pure. Some health food store might have pg.
Hope this helped