Mosin-Nagants, (and, for that matter, mausers...) go for anywhere <$100 to as much as you would ever care to spend. The question is, how does it stack up against what you NEED. It's just one of those things. I remember pics from the 70's oil-embargo days of all kinds of cars and electronics in all of the homes where there were no roads or electricity JUST to prove the "petro-affluence" of the Middle-East residents...
I have a very ugly M-91/30 that will out-shoot me to 500m. US$99 with all the "stuff". My brother has a VERY pretty one. Some Tsarist model. Paid almost $2K for it No idea how it shoots..afraid to get it dirty. AND..it is STILL a re-arsenalled piece. Nothing "mint" or "unissued" about it!