People go to great lengths to save money. Pets goes to great lengths to eat anything in its path. Those two things result in the hunt for coupons. Pet food is a competitive business, with big businesses slinging truckloads of coupons to pursuade a parent to switch their pet’s diet. Even if you’re not fortunate enough to get these coupons, you can always turn to eBay. Here’s a sample listing for Purina Pro Plan foods. It’s a great way to save money on your cat or dog. Just make sure that you read the fine print before bidding (especially the expiration date and shipping costs).