Surefire makes the G2, which has a Nitrolon body, but is otherwise the same internals as their metal-body tactical flashlights. It doesn't have the circumferential grip-ring for the Rogers method, but I bet it wouldn't be hard to find a rubber O-ring to fit securely for that use. It goes for about 35 bucks. It's the one Parruthead is talking about.
I have one; it's a fine flashlight. Also, I have seen many flashlights similar to the Surefire at gunshows that are less than $50.
K