Costco and Sam's Club both offer sweet cream butter, but which warehouse brand delivers the smoothest and creamiest product?

Costco sells house-brand motor oil under the Kirkland Signature label it uses for many other products. Does this oil pass the ...

Costco’s iconic $5 Kirkland Rotisserie Chicken is well worth the price of membership, customers say. “If you buy a rotisserie ...

Costco launched a private label named Kirkland Signature that put a unique spin on the concept of shopping generic. The ...

Costco regulars say these overlooked items—from wipes to sardines—are some of the best bargains in the warehouse.

Lululemon alleges that Costco has stolen the intellectual property of its Scuba hoodies and sweatshirts, Define jackets and ...

Lululemon is suing Costco, alleging the wholesale retailer knowingly sold knockoff versions or dupes of its popular products.

The Canadian athleisure brand has accused the warehouse club operator of copying at least six of its products, including its ...

Vancouver-based Lululemon asserts that Costco sells apparel that mimics the look and feel of its products.