WTB: Shimano Hydraulic Brake Set (Deore)

I have a buddy piecing together his first mtn bike. The brakes that came on his used frame are really shot and mis-aligned, so I'm trying to help him track down a set (or at least rear) of the older Deore level - m535 ish - Shimano hydraulic brakes. Preferably not dual control. If you've upgraded and have a rear or complete set in your parts bin, hit me up and let me know what you're asking. May take a rotor(s) too, if it's not centerlock. Thanks!

Adam