I ran into the same issues with local stores regarding identifying what was "proper" to use for vegetable glycerin.
I finally gave up trying to figure it all out and just ordered online for some LorAnn's VG (vegetable, not just glycerin), from a bakeware shop in Canada and have had ZERO issues with its use.
I definately prefer VG over PG for taste, thickness, and use with 5v mods as well as 3.7v.
Good luck with your search !
Also, it would be very helpful if you & others would fill out your locations in your profile to aid in giving relevant info geared towards your area (even if it were only stating the State or Country).
VapeOn,
Greg