I'm with xj. If you come prepared, and you come in a state where you don't "need" the car, then it's not that big a deal. If you're ready to walk, you don't have to play the waiting game (pre-sale), as they'll get the picture pretty quick. Besides, after SERE, dealing with a salesman is pretty benign (assuming you're prepared).
Using the USAA new price can also be helpful when negotiating the price of a used car, just to show that the dealer's valuation isn't realistic. When I was in Jax, I found a used 4Runner down in Daytona that for some reason was still available after a few days. It was loaded and a 4x4 (hard to come by in FL) with almost no miles on it. I drove down knowing the numbers and made my offer with my trade. They balked and the asst. manager made the mistake of trying to show me what a NEW 4Runner would cost by showing me Edmunds. I was using the NEW USAA price as a bargaining chip when talking about the price for the new one and saying it was the reason I should pay less for the used one. Once he brought Edmunds into the picture, I told him to look up what they were trying to sell me. Bad idea for them, because it was within a ~$100 of what I was offering for the trade and the purchase. They knew I was going to walk if I didn't get the price, so the deal was done. It didn't hurt that it was the end of the month, too.