You'll see them from about 100-175, depending on condition, etc
$120 or so seems the norm.
Occasionally you can find one at a pawn shop mistaken for an M44
Personally, to insure a good rifle, buy one from Allan's Armory. He'll give accurate descriptions and if he sells it, it's topnotch. If you ever resell it, stating that it came from Allan helps also.
Interesting little rifles. If you're collecting Mosins at all, you need a 91/59