I've been working on a home-made one, as a personal side project.
http://solsylva.com/cnc/25x25.shtml
Nothing to do with FRC, it started before I got involved with FRC, and mine was aimed at cutting wood and was never intended to be used for aluminum. The tolerances are probably nowhere near good enough for detailed robotics work.
Still, if I ever get it done, I wonder if my team would find it handy...