I have been reading about Bio-diesel for years. Always wanted to give it a try but never took the plunge. Without wanting to sound stupid, where do you get your WVO? I mean, do you just walk into your local McDonalds and say, "May I please have your waste oil."? Or do you have to look for a mom and pop greasy spoon? Looking around my shop, I've got most of the stuff to do this, except a ready supply of waste oil. Where do I go?