They can usually be had for $150-200 complete in fair (for a mosin) condition. Figure that you will spend $20 for a sight at a flea market or online, another $30-40 for the stock, $20 for a cleaning kit, etc... Then you have to add on s&h for each of those items if they are not local. If you just want to shoot it the way it is or use it for parts its only $100. IMO anything that will go band for that kind of money is a bargain.
Concentrated power is not rendered harmless by the good intentions of those who create it.