Anyone use Rhino with step/dir hardware?

Does anyone know of a method of using Rhino with Step/Direction
hardware, at a reasonable cost?

I contacted Rhino and there is no direct G-code output from the
software and I haven't been able to find a step/dir package that
reads stl files. At present I am running dos / windows and am
reluctant to lean a new operating system such as Linux.

Any help appreciated.