WTB/WTT 870 12 ga barrel

I'm looking for a 18 or 20" barrel, smooth bore, remchoke or bore, 2 3/4 or 3".

I'd like to buy a used one cheap, can be beat up or in ok shape, doesn't really matter

possibly would trade a like new, never fired 20" special purpose remchoke cantilever barrel (Remington lists this barrel at $276, ive seen it for around $250) with Rem cantilever scope rings and all hardware for barrel in new or VG condition + cash.

Basically I'm looking to change my unfired special purpose magnum into an HD type of setup.

prefer FTF in north pittsburgh area, but might be willing to ship. Also will be heading out toward the middle of the state in a few weeks, so I could meet someone on the way.