Buy 100% toluene and mix it down...like getting cordial, the more concentrate, the more brews you can make
I dunno what is with your suppliers, but here in QLD, we can get 20L of Toluene for $42 in good grade...have tried up to 30% and it's still running strong. Is it true for you guys down south that whilst getting it from a BP depot, you didn't need at CAMS license?