* Formal: The starting salary for this position is $50,000, but it is negotiable based on experience and qualifications.
* Informal: I'm willing to sell my old car for $2,000, but that price is negotiable.
* Direct: The deadline for the project is negotiable, but we need to have a firm date by next week.
* With a negative connotation: The landlord was adamant that the rent was not negotiable, despite the condition of the apartment.
Let me know if you'd like to see more examples or need help with a specific context!