I've got an old "10mW"-rated HeNe that I don't have much use for anymore. It's a Uniphase model 1124, manufacture date April 1990, with a benchtop power supply (including interlock, key switch, and keys) to go along with it. Unfortunately, I don't know how many hours it has on it. It's currently producing 5.3 mW measured with a LaserCheck.
Beam size is 2.5mm at aperture and about 12mm at 25ft. Some pics:
Make an offer?