There are pages of coupons on Comcast.net, under the shopping tab. Free shipping is offered on some coupons, percent off, and dollars off by using the code on the coupon.
Join you favorite stores email, newsletter, or club to receive free coupons from the company. They are usually sent to your inbox, but even through the USPS. I have found coupons on the Mall info counter for stores. Just look as you walk past the counter or even ask the attendant for store coupons.
Back to school time and holidays are sure bets for the coupons, keep looking EACH trip to your favorite mall.