I heard the Mosin Carbines are getting harder to find. Maybe someone else can chime in on that.
They were 100$ for a while but recently I think they are around 120$-150$ now.
Check sportsmansguide.com and wideners.com for 7.62x54r. Thats where I bought my last to spam cans (440rounds per) It was 93$ or something after shipping for each can. That was 4 months ago and I haven't check prices lately but i think I saw them in my recent sportmansguide catalog for 130$ per can.
I'd buy it because I think everyone should own a Mosin
