If you know anyone that works in a sheet metal or hvac shop that has a computer controlled plasma cutter then you can definitely get some on the cheap. When I lived in VA I had some good friends that worked in one and they were constantly making things for their Jeeps when they could get away with it. Hood scoops, bumpers, armor, the list goes on.
Search around your area, Im sure there's at least a couple places nearby. Decide what you want, maybe sketch something with dimensions or even better, cut something out of cardboard that looks like what you want and take it down there. If they have some scrap (which they ALWAYS do) then they might not charge you anything besides a little labor, if that. Just make sure you get something that won't rust.
Downside of this is that normally these places dont have plasma cutters that cut very fine, so you'll probably have to grind the edges to make it look good.