The farmers market here is pretty lame. And most of the vendors come from a few miles inns. But I think I can pull it off.If I was you I'd start going to farmer's markets and talk to the people with pumpkins.
Ask lots of questions like: where are you growing? Are you closer/further from the coast? Are your pumpkins open pollinated or cross pollinated? Etc. Etc. If you like their pumpkins- then buy one or two and save the seeds. You're much better off saving and growing local seeds then buying something from far away. Although if you have a seed company that specializes in your area that might be a better place to start. Be warned.... growing pumpkins is not for the faint of heart. Everything wants to eat your pumpkins 🎃