huckster

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

• noun One who sells wares or provisions in the street; a peddler or hawker.
• noun One who uses aggressive, showy, and sometimes devious methods to promote or sell a product.
• noun Informal One who writes advertising copy, especially for radio or television.
• intransitive verb To sell; peddle.
• intransitive verb To promote or attempt to sell (a commercial product, for example) in an overaggressive or showy manner.
• intransitive verb To haggle over; deal in.
• intransitive verb To sell or promote something.

from The Century Dictionary.

• noun A retailer of small articles; a hawker; a peddler; now, especially, a small dealer in agricultural produce.
• noun A wholesale fish-dealer; one who buys fresh fish for shipment to the retail trade.
• To deal in small articles or in petty bargains; hence, to higgle; contend in a small or mean way about monetary transactions.
• To expose for sale; make a matter of bargain.

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

• noun A retailer of small articles, of provisions, and the like; a peddler; a hawker.
• noun A mean, trickish fellow.
• intransitive verb To deal in small articles, or in petty bargains.

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

• noun A peddler or hawker, who sells small items, either door-to-door, from a stall, or in the street
• noun Somebody who sells things in an aggressive or showy manner.
• noun One who deceptively sells fraudulent products.
• noun Somebody who writes advertisements for radio or television.
• verb intransitive To haggle, to wrangle, or to bargain.
• verb transitive To sell or offer goods from place to place, to peddle.
• verb transitive To promote/sell goods in an aggressive/ showy manner.

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

• verb sell or offer for sale from place to place
• noun a person who writes radio or tv advertisements
• verb wrangle (over a price, terms of an agreement, etc.)
• noun a seller of shoddy goods