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 ...

Kirkland Signature spirits are a good buy, often made by reputable brands and sold at a good price. We pick out the tequila ...

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

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

Cheaper look-alikes have been around for years, but social media has made them more popular. Dupes can move into shaky legal ...

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.

Lululemon has filed a lawsuit against Costco that accuses the wholesale club operator of selling lower-priced duplicates of ...

The athletic-wear giant in Lululemon (NASDAQ:LULU) filed suit in California last week, accusing Costco (NASDAQ:COST) of ...

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