O'Reilly's says they will do them while you wait...
http://oreillyauto.custhelp.com/app/answers/detail/a_id/151/~/drum-%2F-rotor-resurfacing

Where are you located?

BTW, the ridge is there because the brake pads don't go all the way to the
edge.  It doesn't affect anything.

Pat

From:   John Rodgers <jrodgers113@GMAIL.COM>
To:     vanagon@GERRY.VANAGON.COM
Date:   12/03/2015 01:59 PM
Subject:        Brake rotors - 1988 GL
Sent by:        Vanagon Mailing List <vanagon@gerry.vanagon.com>

Undertook replacing brake pads today. No problem. Done it before. But this
time, noticed a ridge at the outer rim of the rotors. Decided to have them
machined down but have been unable to find anyone to do the job. Excuse -
"We can't do it unless 'WE' take the rotors off the car. Corporate
Policy! " or " We don't turn VW rotors because you are supposed to just
replace them!" I never heard such bunk. These rotors were brand new last
brake job. There is no scarring, grooving or scratches on them. They are
snooth as a baby' behind. The ONLY thing wrong is that little ridge. The
rotors are still quite  thick and easily would withstand one machining,
maybe even two. In fact, all that really needs doing as a practical matter
is to take the ridge of. The discs would perform well without any further
ado. I'm frustrated, needless to say. Any suggestions?

Johnl