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 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 ...

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

Wondering if you should turn to Costco or Trader Joe's for a cheap, tasty lager? We've got you covered with a detailed ...

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

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

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

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