turbo-flow exhust fan

Back in '03 or '04 I put a Turbo Fan on our bathroom roof hatch. I think it was by MaxxAir. It was a 3 speed reversible with a t-stat. The fan was at the far end faceing almost down, so rain would not effect it, and it was quiter that way. It was a nice unit.
We now have a new mh and I would like to put one in our new mh. But I can not find one, apparently they are not made any more. Anyone know where I could one, new or used.

Thanks,
Dusty