Could you contact the people who put on the quilt show? Maybe they could send you in the right direction.
Here's a few things I found but I don't think it's what you are looking for exactly:
https://www.etsy.com/market/states_fabric
https://www.joann.com/united-states-.../15961873.html
https://www.zazzle.com/us_presidents...11036109437036