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

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

These 18 Costco meals are high in protein (30-plus grams per serving), low in effort, and made with just a few real-food ...

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

Kirkland Signature Organic Extra-Virgin Olive Oil is among the best on the market. The highly hyped oil is sourced from ...

This isn't the first time the athletic wear company has levied an accusation against a retailer selling supposed Lululemon ...

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

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

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.

The warehouse giant is accused of leading customers to believe some of their products are made by the same manufacturers as ...

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