i know... I know,... this is Missouri. Everyone I know, doesn't have any kind of good fertile clay soil. But, I thought I would at least ask.

I am in the process of making a cob outdoor oven, but I don't know where to get some good clay soil.
I live in the Springfield area, and would be willing to travel. Does anyone know of someone who might have some good clay soil and be willing to let me get a some (maybe a couple of wheel barrels)?