Call Lincoln City Sporting Goods, I've seen a number of 45-70 go through there, mostly with threaded barrels...The regrets I have about my collection are that I never found a .44magnum I liked enough to buy or a 45-70 with a threaded barrel. Those two were hard to find even before this madhouse spree. BUT I did think far enough ahead to buy my .50 years ago. Now I suppose there will be no more buying for myself as I, like @nammac am not willing to have my permission slip and inventory publicly accessible.
Tell them what you looking for, Bruce may be able to help you find