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Unless a flavor is named Lactic Acid (left Shelf), these are compounds and chemicals, not flavors. Sigma-Aldrich sells the stuff to make flavors http://www.sigmaaldrich.com/chemistry/chemistry-products.html?TablePage=110273989 but don't make the end product. Nothing to vape as a stand alone on those shelves.
Yeah, Sigma mostly sells precursors. So its not like you could just go in and find a bunch of flavors, but you'd be surprised how much of it you could actually use. The amount of Chemicals on these shelves is a little bit misleading. Alot of it it is pure like Vanillin, isoamyl acetate, ethyl maltol, which can be used as flavor additives.