Amazon.com’s Subscribe & Save service ships various household products (anything from coffee to dishwasher tablets) to your doorstep on a schedule of your choosing, from monthly to every six months. It offers numerous pet-food brands—both grocery-store varieties, like Pedigree and Friskies, and more natural ones, like Newman’s Own Organics—at prices up to 15% lower than what you would pay at a big-box pet store. Bonus: Delivery is free, even for 40-pound bags.
Annual savings: $50
REAL SIMPLE: What to Buy in Bulk