J&G sales
http://www.jgsales.com/index.php
They're not on the website and they only had 4 this morning (well, 3 now). If you call they might still have one.
The 2 I looked at were good. Cylinder was tight all around, timing was good, no cracks in the forcing cone, good screws, Scuffed up finish (rated G-VG) and the rubber grips were separating at the top but the important things were good.
$499.
The -3 is very much pre-lock/mim. No barrel pin but does have the locator pins in the cylinder/extractor. I haven't checked but I think late 1980s.
Cylinder on mine is chamfered in the same style as the Performance Center was using back in the very early 2000s. Didn't notice this until I got home; not sure if the others also have this.
Haven't shot it yet, but that's about as good a price as I've seen for one of these.