If you buy Huggies or Pampers diapers and haven't joined their rewards programs, I would strongly suggest you check it out. You can earn points for each product you purchase of theirs. On the Huggies site, you can earn also points by watching videos or taking polls. With these points, you can either get coupons or other items. Many of the prizes are $25 gift certificates or cash cards which are good for just about anybody!
There are also places online that you can find codes that are out there to get you started: