Look for FSU sellers on eBay, with solid feedback.
When I built my FSU camera collection, I was able to buy many of these for little cash and all were in good shape ( none of mine are for sale) and delivery was reasonable.
A side note; I once bought six Fed LTM rangefinders and they showed up in a canvas bag, like lumpy potatoes, with gritty wax seals and yak hair string stitching the bag shut.
All were working and I did several more deals with that seller, but never bought enough again to rate a second canvas sack.
Good luck!