Give the local dealers here a chance at your business first. Another resource is on Armslist. I've recently seen an FNP 45 Tactical in FDE with extras for a great price.
Have you shot one? It is the first handgun my son finally decided on that was not a commie one, and we got it. Nicer than I thought it would be. The front sight is high for a suppressor so your sight picture is a little different than most guns. Save some $$$ for a burris fastfire 3 or similar, makes shooting it a joy. I'd give a local shop a try, I bought mine locally. Not sure what is in Mont Co but In no particular order , Freestate, Accurate Pawn, A2... Last two are in HoCo.