Google offers a whole slew of AdWords extensions to help richen up your ads on Google's search results.
The ad looks like above, where it shows a "view offer" link with a brief snippet of the deal right in the search ad. When you click on it, you are taken to the Google hosted Google Offers page to claim the deal and use it within the store.
Offer extensions helps you drive more foot traffic to your store or local business by distributing your promotions through your AdWords campaigns.
Consumers can discover relevant offers when they use Google to search for products from their favorite brands and local businesses on their phones, tablets or computers. Once they’ve clicked the “View offer” link on the ad, they’ll be taken to a Google hosted landing page where they can view the offer and either print or save it online (to their “My Offers” page at www.google.com/offers) for use in the store.
Forum discussion at WebmasterWorld.