Try e-gunparts.com
$50 - $100, depending on condition.
The only info I have on the stevens model 94 shotgun is that it was made between the years 1926-1945.
Deer slugs are manufactured for the .410
able firearms on the web
A Savage Stevens model 94 shotgun was made from 1926-1945,there were 934,000 made during this time frame.
410 shells only and only what the barrel is marked for.
Check the on line auction sites to see what they are bringing.
Not sure what you mean by a "12 barrel." If it is a 12 inch long barrel, it has been cut off and is an illegal firearm. In any case, .410 single-shot Stevens guns bring $100 in top condition. sales@countrygunsmith.net
From the information I can find, if it was made before 1968, it probably doesn't have a serial number. In most cases, the serial number on a gun is pretty well out in the open and visable, usually on the receiver.
Get a copy of the Gun Digest Shotgun Assembly/Disassembly manual. It should have the Mod 67.
These single-shot guns dont bring much money, but the magnum with 36" barrel will bring somewhat more than a typical 94F. Figure $75-$125. www.countrygunsmith.net I Bought one today and paid $125. Not worth much money but is a good looking old gun. Couldnt pass it up.