I use a professional researcher in New York who does all the legwork, all that stuff which would take me days and weeks of calling, waiting for people to call back.
We all know, the ones who play golf, know what a wonderful game it is and what a great past-time it is.
If you have a busy natural foods store in your community, give their bulk cornmeal a try: high turnover means the product will most likely be fresh. And if the cornmeal is organic, all the better.