I'm in northeast Florida... I finally found a distributor in Orlando that claims they have a cabinet shop they can sell black 3/4" sheets to but that cabinet shop told me on the phone they couldn't get black...
So, I have since gotten much better at mdf painting and will probably just stick with that for now... it just takes me an extra month to go through all the extra steps to setup my paint tent, prime the cabinet twice with some sanding, then paint a couple of layers of black, sanding, etc....