Yes, it's actually Humco that makes much of the Glycerin USP skin protectant, is what many of us use. I personally by mine from Rite Aid and CVS, relabeled (but sourced from Humco).
For flavorings, The Perfumers Apprentice, Capellas, Natures Flavors (their Coffee bean flavoring system, under Organics) are a couple good sources. For a pure
tobacco base, I like Seedman Commercial cigarette concentrate, available direct from Seedman or from BlueMist (use the concentrate as-is -- the note on Seedman's page about diluting is only for use when you spray it on tobacco to enhance flavoring). FlavourArt is also very popular.
There is a very active DIY
e-liquid area, under Tips and Tricks, on ECF. It has some very good sticky notes, background that people should read.
Good luck!