Where can I buy a .45 colt SAA?

So I accidentally broke my grandpa’s favourite old revolver by not pulling the handle back all the way and then firing so half the barrel is gone.

I want to buy him a WORKING .45 colt SAA like in “Have Gun, Will Travel” (Paladin). He makes and fixes guns and makes his own ammo.

I feel awful and I want to get him one. Any ideas of where I can in either Washington State or Idaho?

Again it needs to be a gun that will fire bullets. Not just a replica