Hi,
I've owned close to a dozen of them over the last couple of years. I still have 4 ex-snipers, an M38 and M44 and a Finn M39. They are about as cheap a full powered rifle as you can get for around a $100. As Sid Post said, I also probably wouldn't bother with a C&R for just one or two guns. There is a lot of paper work and possibly intrusive government inspections involved.
As far as rifles themselves go, they are very interesting to study and shoot. Accuracy will run from about 3" to 6" at about 100 meters. Remember, they are battle rifles, not Palma Match rifles. A word of caution, they were generally sighted in with the bayonet mounted. So when you shoot them with out the bayonet, they often print 3" to 10" to the left. And they all shoot high. As much as a foot or more. Build quality ranges from pretty good finish to the "looks like it was bashed out with a rock" of "42's and '43's. Most were made by Izhevsk though Tula's are also around.
What to look for. Bore condition is everything. Look for strong, sharp rifling. Dark bores may shoot just fine, but the only way to know is to try it. Don't be concerned about seeing a counter-bored muzzle. this was done during refurbishment to restore accuracy.
And speaking of refurbishment, virtually every single imported Mosin is a refurb. After the war, the Soviets embarked on a program to refurbish and then store all their rifles. This was done as much out of paranoia as it was a make work program for people. Since every rifle was totally disassembled and the parts tossed into bins and then inspected and reassembled into rifles, they were also re-serialized to match. So there are very, very, few non forced matched rifles in this country.
Biggest problem people have with shooting Mosin's is "sticky bolt". Some rifles don't tolerate the lacquer coated surplus machine gun ammo that is available today. It can literally take a mallet to pound the bolt open after firing a round. It's considered to be caused by harden lacquer and cosmoline build up in the chamber. An electric drill and a worn out brass 20ga brush and solvent will eventually clean most chambers up. But some rifles just never put up with the lacquer coated stuff. And ALL surplus ammo IS CORROSIVE. Clean accordingly and as soon as you are done shooting. Modern commercial stuff isn't though.
This is just a short over view of a most fascinating rifle. I say get one. You will enjoy shooting it.
dalee