I agree that it is not the store's fault that you have a dent. The cart boy (Cartman?) argument would be your best shot at getting something, but I don't think you'll win. That would mean any fender bender in their lot is immediately their responsibility. These things happen in big parking lots. Sorry!

98 Silver Frost SVT 97 BMW 540I Sport, six speed "Blue is for sky, black is for soil, and white is for simplicity, purity and hope for the future" "A coveted car should never stunt your life, but should make it more rich and interesting."