That price range sounds about right. BPS's seem to hold thier value better, used to be neck and neck with Wingmasters. Only exception is BPS hasn't been sold down the road in the form of an xpress yet.
I started using an auto for ducks abd geese. I gave my 870 Wingy a second life as a slug gun. 2 3/4" slugs are plenty for power, not many use the 3".
Those barrels could also be traded/sold off and the gun could be outfitted as a home defense gun, extended choke tube, new stock etc..
The gun is worth more in the cabinet than on the chopping block.