Cable Trough or Cable Chain

I've been looking for a manufacturer of the plastic
chain product that is used as a cable trough on gantry
type equipment. The product I'm looking for is shown
at the bottom of the web page
http://www.practicalcnc.com/

This web page shows a gantry for a plasma cnc cutter
than is apparently made from 80/20 extrusion and uses
the product I'm interested in to transport the cables.
If anyone knows a source for this product, I'd
appreciate very much knowing where to buy some,
especially if not too expensive. Thanks in advance.

Norm Larson

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