A:I'm afraid your price is much too high. You know our order is a sizable one.
B:May I ask what size of your order is?
B:You can hardly call it a sizable order, can you?
A:But still it is an order of some size, moreover, we are not your new customers. I hope you will leave us some margin to cover the advertising expenses.
B:Then what's your idea?
A:45 dollars per dozen is the best we can do.
B:You mean we reduce the price and your counter-offer is too wide. The best we can do will be a reduction of 3 dollars. I must say it is our lowest price and we can't go any further.