Suppliers might offer the best & final offer. This tactic often signals the end of a negotiation on a given issue.
If the buyer doesn’t accept this offer, the supplier must be prepared.
Example:
“This is the lowest price that we can sell.”
Altogether, including transportation, this is the final price.
Seem to be inflexible. But, actually, we can handle this tactic.
To respond – think if you may pretend to exit from the negotiation to know his real intention
Change issues, propose new solution, propose more difficult problem to control the situation