Wait don't call dealer A for anything!!!! just sit tight and check with dealer B if they can get that car... because if dealer A finds out that you have a deposit with dealer B there is no way i hell they will trade that car... If you can get your deal matched with dealer A and willing to lose $500 bucks call dealer A if not wait at least 1 week to give dealer B a chance to get your car.... seems like time is the only thing that can fix your little dilema... I know Dealer B wants your business but sometimes dealers can not get cars as fast as they wish they could... good luck