Still looking for front calipers? I've got my set with 32k miles on them. I've got the rotors, but they are thin enough you would be better off putting new rotors on them. I've got the original lines and stainless lines (front only).
Rebuilt ones from RockAuto Auto Parts are under $100 each and rotors are pretty cheap also. Unless your budget is really tight I would be inclined to go that way instead of used.
I've got a good used set of calipers here and would fix you up with them and our WMW rotors, or you could get our WMW drilled/slotted rotors cheap.
Thanks folks but I picked up a set of 2010 R56 MCS front calipers, red caliper paint and some JCW caliper stickers and made my own set of JCW brakes, same upgrade as the 1st. generations would get except did mine on the cheap