I also did experience shipping quotes from Czerny’s which seemed to be in line with other auctions. If you find a cheaper carrier, I‘d guess they would be happy to hand over your piece and even do the packing for a nominal fee.
If I understand correctly, the main issue with Italy are national legislations imposing quite a bit of rules and associated paperwork on selling and shipping hot as well as cold iron... Even traveling with a very simple pocket knife is pretty much outlawed - I’m sure this really helps with fighting the mafia...
As Philip points out, the idiosyncratic rules of the carriers are often a greater pain than national and international regulations. Even USPS is known to decline overseas shipping of items which are perfectly legal and not restricted in the destination country (as well as the US)!
And, yes, ebay’s global shipping makes things even worse and is much more expensive than any regular shipping including customs fees.
Did I mention my pet peeve - currency exchange rates and fees?