The majority here are like proverbial crabs in a barrel. You are actually wise trying to be frugal from the get-go, something which most of the clueless deadenders here would never understand. Do confirm if importing with your friend is viable (which is exactly why you posted here). Long term, there has to be a supplier somewhere that can beat whoever quoted you previously. A few years back, in Vietnam, I spotted all kinds of imported concentrates for commercial resale. I would think Thailand has even better import supply options than Vietnam, though I might be wrong.