Your Price, My Terms; Your Terms, My Price!! ─ Law #23
An effective approach in a negotiation is to make it clear that the other side cannot have both favorable price and favorable terms.
If the vendor wants tons of money for his or her product, then a long payment cycle will be appropriate. However, if they want cash up front, then the price should be heavily discounted.
The Chinese have a proverb that says, “If both parties leave a negotiation smiling it is a success.”