The Highwaymen art.. it all started in the 1950's, when a small group of African Americans started painting Florida Landscapes.
They would go from town to town, city to city, painting and selling their work.
Later the group of artists became known as the "Florida Highwaymen."
Their work is very much collected, and I have managed to organized a page from Ebay, which is one of the largest sources of collectible art. This is a live and current page, and you can bid, buy or search from this page. As you can see by the activity, this is a very popular group of artists.
Just click on the link and then on any title for more information, or to register with Ebay, if you are not already, or to go searching further through the category... have fun!