I almost got one for eur 500 (or in that area), in M mount, non TV version (which I believe is more highly regarded or something). That was a sad story actually. That was two years ago and when the guy agreed on 600 I first thought he knew nothing about photo equipment. Turned out not so, he was an RF enthusiast and simply didn't care about making money on that lens, just wanted to make some space. Long story short, the only M mount camera I had at the time was Bessa R3A. I took the lens (it was in excellent condition) but before mounting paused to look at the release button (those lenses are very large in diameter and cover the button). All of a sudden the guy takes the lens and tells me I can't mount it on a Bessa because he doubted it could release again. Turns out he converted the lens for only certain Leica models that don't have that little border around the release button. I was still ready to buy it, but he wouldn't sell it to me 🙁
Hmmm... since he's such an enthusiast, maybe he posts here?! Hello guy (sorry forgot your name) - I have other M mount cameras now, can I have that lens please? 🙂