You could make it easily, either on plywood or nail some thin boards together then trace out the shape and paint out the country in a watered down white paint. They use a watered down charcoal grey or black paint to paint the borders. make sure to wipe off the excess paint in the direction of the grain to keep it transparent.

https://www.potterybarn.com/products/planked-wood-panels-usa-wall-art/?catalogId=84&sku=430095&cm_ven=PLA&cm_cat=Google&cm_pla=Decor%20%26%20Pillows%20%3E%20Decorative%20Art&kwid=productads-adid^202405455967-device^c-plaid^328117582680-sku^430095-adType^PLA&gclid=EAIaIQobChMIv6jYxcb91wIVjj2BCh2OeQRYEAYYASABEgIZ3fD_BwE&cm_ite=[[PLA]%20-%20Bad%20Desktop]