To get your coupon wait until November twenty-third then go to Dr. Pepper's website. Register to received a coupon for a free 20 ounce Dr. Pepper and then take it to any retailer when the coupon arrives.
Dr. Pepper says the coupons will be available for 24 hours starting at 12:01 a.m. eastern time on November twenty-third. It will take 4-6 weeks for the coupons to arrive. They will expire on February 28, 2009. Full terms and conditions are on Dr. Pepper's website.