The dealerships are the same way here in Orlando. The dealership wanted $25 a side for headlight wiper blades and were rude when I asked if they would honor my MBCA discount.

After that phone call I called MBUSA customer support and let them know how rude the dealership was and how inflated their prices are. If I need dealership only parts I order from a dealership in Cali which has very very fair prices and are more about customer service than making a buck.