Haggler n. : One who haggles or is difficult in bargaining.

Haggler n. : One who forestalls a market; a middleman between producer and dealer in London vegetable markets.

Example:
Marvelous Marvin Haggler against John the beast Mugabe?

Taxonomy
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Defination from the web:
haggler. If you're looking to save money, haggling is a crucial skill. Rather than going to a big retailer and buying whatever you can...