Are round removable headlight covers available?

I was wondering if anyone makes smoked out plexiglass covers for round headlights, that are removable. I see them for all types of import cars, but I cant seem to find any to fit regular round headlights. The only ones I have run across, are the type that have adhesive on them, and they are not reusable. They used to make the type that clipped on, but I cant find them anywhere.