haggle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To bargain, as over the price of something; dicker.
• intransitive verb To argue in an attempt to come to terms.
• intransitive verb To cut (something) in a crude, unskillful manner; hack.
• intransitive verb Archaic To harass or worry by wrangling.
• noun An instance of bargaining or arguing.

from The Century Dictionary.

• To hail.
• To hack roughly; cut or chop in an unskilful manner; mangle in cutting.
• To tease; worry.
• To bargain in a petty and tedious manner; higgle; stick at small matters; cavil.
• noun A haggling or chaffering.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act or process of haggling.
• transitive verb To cut roughly or hack; to cut into small pieces; to notch or cut in an unskillful manner; to make rough or mangle by cutting.
• intransitive verb To be difficult in bargaining; to stick at small matters; to chaffer; to higgle.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb intransitive To argue for a better deal, especially over prices with a seller.
• verb transitive To hack (cut crudely)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an instance of intense argument (as in bargaining)
• verb wrangle (over a price, terms of an agreement, etc.)