I feel your pain. I haven't made any bio yet because I figured that its beeing done so I dont need to make some in the good pots to see if I could do it. I went strait to the search of oil, corn that is. Slippery gold, Bomers Tee. I tried the fast food route but was told "Submit your proposal to our corporate office and... ... ..... " So next I tried the small restaurant path and found the quantity would make for to many and unreliable sources. One must think big. I dont want to give away to much info that might cost me my oil localy but look for bulk food companies that use truckloads. Get in tight with the minimum wage guy that has to shclep that S**T out back and set him up with some "tips" for saving you some. Think outside the pump.