A friend just had two bumpers and 5 hubcaps re-chromed for a 1936 British Ford. Small cars, small bumpers. They were in decent shape but took a bit of hammering before plating. Total cost $2000! Crazy! But that includes 12% tax plus an environmental fee.
I was talking to the plater about doing my 49 bumpers ($600 each!) and he said its cheaper to buy reproduction units although they are not as good. I asked about stainless and he said it was good at one time but now these stainless bumpers are coming from Asia and you can expect them to rust eventually.