An ad in the Classifieds perhaps. Also, keep an eye on the auctions of our head gorilla here, handejector.
I bought a 66 no dash 4" in prime condition just this week off Gunbroker. (Pics to follow when I've picked it up.) I understand your reluctance to deal there, but speaking for myself, I have never been disappointed by anything I have bought there, and that's well over a dozen items. I've also sold on there.
You might want to specify in any post about these whether you are looking for the no dash model with the stainless rear sight. Those are relatively rare compared to the ones with the black sight.
As for pricing, just to give you an idea, I got mine for $850 unfired, box and papers, unopened cleaning kit. I've seen them go for over $1,000 in that condition. If you found one in a gun shop, it would probably be less, but you'd have to be diligent and patient.