I've found in some cases though, that you'll often find
the best deal by comparing total price (cost of items + S/H). Sometimes, even if a vendor has Free S/H...
the total price is less elsewhere, even on glass bottles. Glass Bottle Outlet is often an example of 1 whose total price beats others.
@IDJoel and I both order from Glass Bottle Outlet, and from Bulk Apothecary (PG & VG), because they're examples of places where the "total price" is usually better than at other vendors. There are other people who order from them, too, but I can't remember who else off the top of my head now.