Had a good experience with Southwest Engravers yesterday. Highly recommended. She did it in about 5 minutes while I waited, it looks good, and it was only $15. Be aware though she can't do it on the front of mag wells or on the underside next to the trigger slot due to the way the machine is set up. I went next to the safety markings on the right side.
She did mine on the inside of the trigger guard. I wonder if she changed machines.