Bacon—the unofficial mascot of breakfast and brunch. While Costco's Kirkland Signature bacon gets a lot of hype, Sam’s Club has been quietly winning the bacon battle with better pricing and surprising consistency. A two-pack of Member’s Mark hickory-smoked bacon regularly undercuts Costco by $2 to $4, depending on your location.

Having a warehouse chain membership is helpful for buying discount groceries. When it comes to senior discounts, here's how Sam's Club beats Costco.

Parade. Costco is just as famous for selling massive quantities of everything as it is for its food. In addition to offering huge slices of pizza oozing with cheese at its food court, the wholesaler is also known for its take-and-bake pizzas.