I have half a dozen Mosins and yes, the prices began creeping up about two years ago and now they are racing up. Especially the Finnish varieties but even the plain Jane Russians have gone way up. I bought my first Mosin 91/30 at Big 5 on weekend sale for $89.00 in 2013. That same rifle today can easily fetch $250.00. Mosins are still a good deal and super fun to shoot. They are rough, crude but they reek of history, are one of the most fun to collect. A lot of Mauser people hate Mosins but if you take them for what they were, a basic, crude, rugged peasants rifle, they are great fun. They seemed to have been used to kill plenty of Nazis who were armed with the superior Mauser.
Unfortunately the milsurp ammo has become scarce, the costs have gone way up too as it can no longer be imported from Russia thanks to our buddy Dear Leader. They can still import Ukraine, Bulgarian Silver Tip, etc. but overall, spam can Mosin ammo has also almost doubled in price since 2014. For once, I was ahead of the curve and stocked up while it was cheap. You can, of course, reload for the Mosin but it is not worth it for most Mosins, the ammo will be more accurate than the gun and Mosin bullets are expensive and the case is large and takes a lot of powder. As long as milsurp ammo is available, reloading doesn't make sense for most Mosin owners, other than Finn Mosins, which are generally a lot more accurate.