Nobody turns brake rotors in the US anymore. If your price sensitive, you'll just buy a Chinese-made rotor for about what turning would cost. If you're not so price sensitive, chances are good that your brake rotors use an alloy that the old brake lathes can't cut anyway.

I used to get rotors turned. Then I stopped because it was a pain. Unless a rotor has been grooved by a completely worn brake pad (i.e. the backing plate and rivets made contact), I haven't seen any difference in performance or longevity.