If you have the ability to build something that lasts and have a large trailer you could use to deliver it, there is definitely a market.
I’m currently trying to talk my hubby into designing a coop that would be under $300 to build, could be sold for $450-$500, could be transported, is shorter than a suburban fence height and fits 6 full size chickens. It’s so hot in Texas that multiple walls need to be hardware cloth for ventilation, which drops the cost and weight.
I’ll attach pics of a pretty functional coop that is in one of the homestead books. Did not look like a difficult build.