Of course your friendly local dealer's parts department could could give you a $$ quote. The price thru one of the discount internet parts vendors should be cheaper.
Still too much? Salvage yards. Since the Armada is is kinda new, I doubt the second tier body part industry makes that part. But check with a body shop.
You guys do know it's the entire bumper right?? Not just a chrome piece in the middle. It's a full chrome bumper that runs from side to side (under the side rubber bumper caps also) and costs around $348 (Body shop discount price), lord knows what the dealer will want for it.