Tom & Eileen:
Here is a website that you might try.
http://www.fairsigns.com/
Try page 3 of the samples (the last sign). Seems like a TM in the center with names and state are a good combo. Their email address is included so you might ask them how to get a custom sign made. It looks like they can take some sort of clip art or maybe any drawing and do a custom carving for somewhere in the neighborhood of $50 to $70.
Here is a second website I found -- these might be a bit more expensive.
http://www.syverstad.com/
Ed