Where can I purchase a basic CSA Alpine Tracker?

It is a very basic ski machine: the footpads move opposite each other on rails kept in synch via a strap: one foot moves forward the strap ensures the other moves back. The track has an adjustable knob to change the resistance of the foot pads. The poles are attached to the rails and have small pnuematic parts so arms get resistance to work with. It folds flat for easy storage. The tracker does not have any electronics or arm cables on it. If I can get one, I'll buy two because it was that much fun to use!