Costco has mastered the impulse buy. Shoppers pop in for eggs or rotisserie chicken only to wheel out baskets piled higher than a tractor trailer.

Last October Ann Watson strolled into her local Costco with a shopping list and a sense of purpose. From the $330 giant Halloween skeleton to the $1,000 backyard playset, her O’Fallon ...

Mrs. Fields Cookie Deluxe Bites Basket, $79.99, comes with 144 assorted Nibblers bite-sized cookies and 48 brownie bites in ...

A registered dietitian shares the 10 foods she always buys at Costco, including protein picks, veggies, and her favorite cheese.