There are a number of plating shops in Phoenix,but you should be aware that plating rims is very difficult and very expensive.In fact it's going to cost around a hundred dollars per rim minimum.As it's such a difficult job it's hard to find anyone to do it quickly as the best shops are always backed up.American Plating Incorporated 202 W Gibson Ln Phoenix, AZ (602) 253-2830 is a good place to start,but you'll have to shop around to get what you want.