The retro-inspired Tupperware went viral on social media, with shoppers citing it as a "sweet deal." One Costco goer even ...

Costco's vast warehouses and tempting offers have made it a retail giant. Yet, behind its towering shelves lies a clever market trick designed to influence your shopping decisions.

Costco officially rolled out new shopping hours for its U.S. executive members on Monday, enabling them to squeeze in some morning shopping before other types of members.