What could you tell me about Agri Biodiesel?

A few months ago, when diesel was a buck more a gallon, I was running the Agri B-99 between my own batches. Now I'm getting #2 500ppm petro fuel for $3.85 per gallon and blending it with my stuff.

Western States Patrolium is currently charging $4.29 per gallon for the Agri B-99.

Is Agri Biodiesel a large company?
How is price figured when it comes to Bio? I imagine crops have alot to do with it. Is the cost tied to petro in any way?