Yesterday's paper had a coupon for a free can of mighty dog. I did not receive it in my paper but my sister in the upper Midwest did. If your area did not carry the coupon you can always check an online trading group, coupon service or Ebay.
Right now most stores are focused on back to school with low cost school supplies and clothing. I'm currently stocking up on school supplies like highlighters, pens and office paper to donate to my local humane society. Many blogs are doing posts on creative ways to use school supplies like Freebies for Mom and others. There are some neat suggestions for those of us without school age children. Another way to take advantage of the folders and glue sticks would be to make an emergency file for your pet. Use a standard folder or file folder to hold all their vet visits, medication information, along with any allergies. One place with all the information you need on hand to plan for upcoming visits(for instance your pet will need their bordetella vaccine every 6 months.) and budget accordingly. Also, you could keep another folder with receipts in case a great pet food rebate comes up!