I just rented a car in Las Vegas via a Priceline winning bid for an economy car with National. The representative at the regular desk told me that if you are an Emerald Club member, you can get any car you want using your Priceline winning bid. Simply go to the Emerald Club, pick out your car, and get on your way. No need to show your Priceline confirm or anything. My Emerald membership had expired because I hadn't used it for so long, so I didn't get to try this. But I will next time. Do people know about this loophole?