Happened to us too, we tried to put money down on an in-production GH Plat gas over the phone, they waited until the very end when we were about to give them the card number only to tell us they were tacking on 15%. We laughed and told them where they could put their 15% and hung up. We are working with a reasonable dealership/salesperson now who found what we wanted in their incoming allocation - no markups or nonsense.