Everything's bigger at Costco, including the chain's brand-new deli sandwich — a massive beef and pork meatball sub complete with parmesan and provolone cheese, as well as an insane amount of ...

From new menu items to ordering process tweaks, here are five notable changes that have hit Costco stores this year.

That's because clever Costco shoppers have revealed that Kirkland Signature Lightly Breaded Chicken Breast Fillets are a ...