bargainer

noun

1. a mutual agreement or contract in which the parties settle on what should be given or done by each
2. the terms of such an agreement
3. such an agreement considered in terms of its worth to one of the parties: to make a bad bargain
4. something offered, bought, or sold at a price favorable to the buyer

intransitive verb

1. to discuss the details of a transaction, contract, treaty, etc., trying to get the best possible terms
2. to make a bargain or agreement

transitive verb