Well-known companies offer sweepstakes as a way of advertising.  These sweepstakes are free of charge and fun to enter.  

Sponsored Link: 

Click on a link on the left hand side for different types of sweepstakes to enter. Some can be entered daily, weekly, or even monthly while others can be entered only once.

If you prefer not to receive communication from the companies whose sweepstakes you've entered, other than if you've won, be sure to uncheck the opt-in boxes on the sweepstakes entry page or use a separate email just for sweepstakes.