My son picked up a mint 135mm f:2.8 MC Rokkor (with mint original case) about a year ago that has become his favorite lens. He often uses it with extension tubes, and I've seen the results from it on the old Velvia 50 at large projection sizes alongside the same subjects shot on the Zuiko 90 Macro and the 100mm f:4 Macro Elmar. It does a very fine job in this company, and was a huge bargain at the $50 he paid for it.
He also picked up an SRT 101 with MLU in excellent condition today, only needs light seals and mirror pad, meter is working fine, no evident wear on the film pressure plate, for $20. I'd have bought it if he'd turned it down, and I don't shoot Minoltas myself. :)