I just bought one at a gun show for $125. Haven't seen 'em for under $100. You need to know that the ammo is very expensive, and only made by one company that I know of. Fiocchi is the only current producer of 7.62 Nagant, and it runs $30 or more per box of 50. You used to be able to get an extra cylinder that would use .32 ACP, but haven't seen one of those in a long while.
Also, these are not the most accurate weapon you can find, but in spite of all that, they're great fun to shoot. Very low recoil. Think 22LR +P.