Good to here from you again, Bob!
I personally would have paled at the thought of even $750, but that's me as I have little or no use for a .410 barrel on a 99 no matter what barrel length. I've shot them and discovered that they make fairly miserable shotguns, poorly balanced and difficult to hit flying targets with. I recognize the novelty factor and the desire for one as such, but that's as far as it goes.