Hi Joey,
I 2nd stevebrot's last comment. You can hardly go wrong with ANY 135mm lens.
One thing that's not been mentioned is the nice handling of a sliding hood. It is really very much better to use than a fixed hood, much more compact.
Of all those lenses already mentioned here's my pick in terms of likely-to-get and cheap (apart from Pentax lenses):
Vivitar lenses serials #22xxx and 28xxx
Any Sears lens (as far as I can tell)
Any Chinon lens
Any Cosina lens
My big fave is the already-mentioned Carl Zeiss Jena MC Sonnar 3.5/135, but it's out of the price range I'm afraid. The MC Jupiter 37A(M) is a remake of this lens.
You could get one of these cheaply maybe if you are patiently looking for Praktica or Zenith cameras and those lenses coming with it.

CZJ MC Sonnar on K100D, no PP JPG + crop. 3.3ft near distance and sliding hood :-)
Good luck in hunting, Georg (the other)