Finding a good plating vendor in SoCal is next to impossible. I have tried many withou much success. They are right up there with heat vendors, grinders, and custom tool makers with regards to quality issues.
Beyond that, there are several different types of chrome processes out there, so you should learn a bit about what you are paying for prior to choosing a shop. On top of that, used parts are almost always more expensive to deal with unless you can provide them to the vendor in a blasted and polished condition.
Powder coating may actually be a better route to go for the general hobbyist, unless of course you hate yourself and like dealing with retarded folks.