Check the advertisers ads at:
finishing.com http://www.finishing.com/index.html
Metal Finishing http://www.thru.to/mf
Products Finishing http://www.pfonline.com/
It helps to have the hard copies of the latter 2 magazines, since the classified ads in back aren’t always on-line. Both are free if you’re in the finishing business.

Plating & Surface Finishing is a paid subscription thing, but they have a list of advertiser links:  http://www.aesf.org/plating/psf-qwiklynx.html

Asset Exchange (Phoenix) has lots of stuff: http://www.asset-exchange.com/

Western Equipment Co. (Anaheim) has various new & used equipment: http://www.westernequipmentco.com/

Good luck,
Ken