Caution: Non-Mopar parts involved whistle

I'm rebuilding a Ford FE (390) and the rocker arm tips are badly worn. New rockers are rather expensive nowadays.

Can anyone recommend a machine shop that can reface them? As usual, nobody 'round here does, so it's time to mail them out shruggy
What might I expect to pay for refacing all 16 rockers?

thanks for any info.