hard sell

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

• noun An aggressive, high-pressure method of method of selling or promotion.
• noun A product, plan, or concept that people are reluctant to buy or accept.
• noun A person or group that resists pressure to buy or agree to something.

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

• noun A sales technique of pressuring the potential buyer to agree to a purchase.
• noun A sales transaction which is challenging for the sales person to make; any act or object of persuasion which is challenging.

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

• noun forceful and insistent advertising