I’ve been looking into doing bio or WVO myself. As others have stated finding a source was the hardest part and the most important. I struck out at most of the restaurants before having a AH moment. I suddenly remembered many, many moons ago when I was in high school I worked in a grocery store and our deli would go through tons of oil. Its one of those places few think of, but well worth checking into. It paid off for me. Now I just need to get all the other stuff put together.