Costco’s free samples are one of life’s simple pleasures. There you are, perusing bulk buy after bulk buy, and, like an oasis in the desert, a kind soul offers you a snack. Maybe it’s a piece of bread ...

Snacking on tasty free samples at Costco is as much a part of the warehouse club experience as its $4.99 rotisserie chicken or one of the food court’s oversized chocolate chip cookies. And if your ...