In California, ther eis a company caleld Safe Plating that recently plated 15,000 parts for me in Nickle. Perfect, perfect job. I'm very happy with them.
www.safeplating.com
If someone is in the Tennessee area, there is a company in Nashville called Advanced Plating. I have used them before, and am extremly happy with them. They do excellent show-car plating, and do the nickel and chrome plating for Gibson Guitars, as well.
Extremely nice stuff from them.
FWIW, Chrome sucks. Go heavy, bright nickle. No electrical wire soldering needed. for "bright nickle" plating.