FallisPhoto
Veteran
$50 was a very reasonable price. As long as the bellows are OK, cleaning the shutter, the lens and readjusting focus is really not too difficult. Even Fallis's $80 is not unreasonable. But for $130+40, I would probably look for something with a slightly better lens. I had a Nettar somewhile ago and I think it is good for landscape and B&W, showing good shadow details and sufficiently sharp at the corners once stopped down to f11 or thereabout.
If you think your focus is a bit out, you can easily adjust it by the groundglass/loupe method. With good daylight it can be done in less than a minute.
$40? That's way out of line! I've never paid more than $15 + shipping for a Nettar, and I have bought several.