Not sure what you are calling "industrial", but I purchase the majority of my o-rings in bulk from a place called "the o-ring store". The majority of o-rings used in airbrushes is Buna-n or nitrile, so I just figure out what sizes I need, and generally order 50 or so at a time. If you mean different material, well, I have had some custom ones made before. Commercially, there are not many other compounds available in sizes we need, that are cost effective to use.