Creio que seja isto.

In the United States consumer sales promotions known as sweepstakes or simply sweeps (both single and plural) have become associated with marketing promotions targeted toward both generating enthusiasm and providing incentive reactions among customers by enticing consumers to submit free entries into drawings of chance (and not skill) that are tied to product or service awareness wherein the featured prizes are given away by sponsoring companies. Prizes can vary in value from less than one dollar to more than one million U.S. dollars and can be in the form of cash, cars, homes, electronics, etc
http://en.wikipedia.org/wiki/Sweepstakes