I'll take care of Michigan for you, Clay. The family and I are going to an apple orchard in the next week or two, so we'll see what I can dig up on the way. Too bad your project didn't commence a few weeks ago -- I could have gotten you clay from both of our fine peninsulas while we were on vacation.
*random side note*
I got my Orc & Pie t-shirt from BN a couple of weeks ago, and have worn it for each of our last two sessions. Normally I'm not one for the ubergeek RPG stuff, but I love my new t-shirt!!