IPA: /ˈbɑːrɡɪnər/
KK: /ˈbɑrɡɪnər/
A person who negotiates or makes deals, often to get a better price or terms.
She is a skilled bargainer who always finds the best deals at the market.
Bargainer → It is formed from "bargain" (from Middle English *bargain*, meaning an agreement or deal) and "-er" (meaning a person who). A bargainer is a person who engages in making agreements or deals.
Think of someone who is making a deal or agreement — that's what a bargainer does.