Need clay source around Detroit, MI
I need a clay source around Detroit, MI. I have not sculpted since I was a child and want to get into it seriously. I found the company "The Compleat Sculptor" and their prices are acceptable, but shipping costs make the prices unpalatable. This is probably an easy question for an experience Detroit area sculptor, as I suspect the auto industry here would cause a lot of clay to be in the area, but I have no idea where to start looking.
I am looking for a reasonably priced source of from 100-200 pound of (most likely) oil based clay. Any help would be appreciated. Thanks.