You could have a gunsmith take a look at it, and see if he could thread the barrel for you. That would cost just a fraction of the cost of a new barrel.
I asked a gunsmith here in my town about it. His reply was if the smith has been in the same shop for more then two years then he is a good gunsmith. Yes they thread shotgun barrels all the time. Average cost between 35.00 to 45.00Is that a pretty standard request for a gunsmith? Can I trust pretty much anyone to do it properly?