or you could just prep them yourself first... do all the stuff the body shop wouldnt do, like sand them down to a smooth finish. I would imagine about an hour with a 1500g wetsand would probably take the texture out of them... and if you're really meticulous, you could buff them afterward.
plus, doing any prep work yourself, will cut down on costs. even if its as simple as removing or taping over the mirror itself, because you know they'll charge you extra if they have to disassemble or mask off a part.