I'm a big fan of Win 1300's and have 7 of them. I happened across a guy years ago who worked for Winchester and when they closed their doors he bought up all the barrels and stocks and misc parts he could for the 1300's. I just checked and most of the 12 Gauge stuff is gone, but they still have 20 gauge barrels in 22,24,26 & 28" for $99 each.
I'll PM you their number.