You can find 12ga barrels for $500-$600. 20ga barrels are much more... unless you can find an individual selling a set. Like oldman said, you can get 686E Sporting 20ga... they came with 30" bbls but they are hard to find. I almost bid on one once before... I think it sold for $1400. The receiver looks more like a 682... not very traditional.

I already called Joel Etchens.... they can get 30" 20ga barrels (for a 20ga frame) for $1300... that cheaper than Coles by more than a $100.

Adam