Enter the Staples Back to School Sweepstakes for the chance to win a new HP Envy 6 Sleekbook. Your prize also includes a Staples Savings Pass, so that you can save 15% off all your back to school goodies. They are giving away one prize package each day until August 11th. To enter, you must follow Staples on twitter, and retweet the sweepstakes. You can retweet and enter up to once per day.