You can’t even make one yourself for $40.
Easily done [40 bucks] with plastic cardboard, type used for Real estate yard signs, molding strips & Al duct tape or fiberglass strips and a good design. I ain't designing it for you though, do some research and find one.
Hint; look for "Hexar" dlb design, and modify it. His flies on central 54 and 3-38's