Mossberg 1000 barrels will fit the Smith & Wesson 1000 Super 12 only !!
Try e-gunparts.com
20-1000 usd
It will be marked on the barrel
100-1000 depending on specifics
100-1000 USD
75-1000 depending on specifics
They stopped making them in the 80's. So if you can find them one in the box it's. $700 or more easy, and its still a Smith & Wesson. Super collectable.
50-500 usd
100-1000 usd
100-1000 usd
100-1000 USD
150-400 USD depending on condition.