As far as I've been able to see, these barrels come up (rarely) on the internet "For Sale" sites such as www.24hourcampfire.com etc. It is worth trying a (free) WTB listing for them. They also come up more frequently (but still rarely) on EBay when somebody "parts out" a 330. But they don't last long.
All I can say is try all the "parts houses," the WTB sections of GunBroker, Calguns.net, etc, and monitor EBay. It may take a while. Sometimes somebody sells the extra barrels from a 330 2-guage set, and when they do, it's almost always the 12 guage barrels.
Hope you get lucky. The only Savage/Valmet barrels that I KNOW will also fit the 330 are the Model 2400 combination gun barrels and they are scarce as hen's teeth. The pre-Savage "Valmet Lion" barrels imported by Sloan's (I think) will also fit but are also scarce, and most of them have an added PolyChoke VR, which I think Sloans (?) added to appeal to American shooters.
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