If you have someone local, that would probably be best for you. You can get an exact quote and any problems can be taken care of right away. And, of course, you support your local business.
If not, Superior Chrome in San Jose, CA:
www.superiorchromeplating.com. But, you will then need to worry about shipping and stuff. They do good work, but if you have a quality problem, then you have to worry about back and forth communications and more shipping.
If you have stainless, brass, or aluminum to polish, you can try Harvey at HarveyChenier710@aol.com. He's an Oldgas guy that does real good polishing work, but no plating. You see his stuff every now and then.