Negotiating a Price

We're interested in placing a large order, but your price is a little high.

I understand. How many units are you thinking of?

Around five thousand, with regular orders after that.

For that quantity, we could offer a discount of ten percent.

Could you go to fifteen if we sign a twelve-month contract?

I could do twelve percent, as long as payment is made within thirty days.

That sounds reasonable. Let's put it in writing.