The nagant stops being cheap by the time you sporterize it. You'll be in between $80-$120 for the rifle. $50 or so for a synthetic stock and $35+ for the scope mounts. Also, it will have to be drilled and taped, and the bolt cut off and altered. I've done it for ppl, and they really aren't saving any money. Go with the stevens like mentioned above^^^.
-Jake