I did find a Leica at a garage sale, maybe 15 or 20 years ago. An old woman had a garage sale and my wife and I looked at it and turned to walk away. The woman asked whether we were looking for anything in particular and I mentioned cameras. She said that she had one; it was old, bought by her husband in Germany. She brought it out, a Leica (I don't know the model) with a lens and asked $100 for it.
I can't do that to a widow. I gave her the names of a couple of folks who wouldn't rip her off quite that much and went on my way. I wonder whether she ever sold it, or whether it ended up getting thrown out when she passed on. *Sigh*
Well, you could have explained what it was to her. If she still wanted $100 for it, you can take it without having a weight on your conscience
I've had one similar great deal on an old Canon rangefinder, I think the seller was more happy that it was going to be used than she was about the money.