Is this 4wd or 2wd?
I've physically seen shops turn our rotors. They just have to be equipped to do so.
One shop used a turning mill that turned the rotor while it was still on the truck.
Another shop had a CNC turning center on-site. In that case all the measuring and machining activities were left to the machine. The operator/mechanic only had to plug in the vehicle values and the machine went to work.
The one time use nut seems awfully high too! I think RockAuto and a few other guys seem to have it ranging in the mid to low 20s ($).
I can understand a company trying to make a buck, but some of these prices are...
IMO, I'd seek other bids/quotes.
p.s.: My dealer quoted me 195.xx per a rotor at the counter. I have a 2wd (non-HD pkg.)