IMHO, any Carcano over $220, would have to be an excellent specimen. I agree rare ones may be worth more. They are common at gunshows, at least in my area and in TX. I picked up a 7.35 in as issued condition with the bayonet & sling for $175. That was 1 year ago. It has turned out to be an excellent shooter.
I have seen Carcanos list for much more on the auction sites, but they have been on the auction site for a long time.