Costco's website currently features a $320,000 diamond engagement ring as well as a $2,500 espresso machine. "A Porsche dealer in Seattle put their cars on the floor of a Costco, and they sold out ...

10-karat diamonds,” James said. While most of Costco’s members are “average-income earners,” James noted that “affluent members with two times the average income” allow the business to ...

While there aren't tons of bakery items in the under-$5 range, there is one you shouldn't skip. Just one baguette is about $5 at most bakeries. At Costco, you get two for $4.99. Insider tip: Many ...

Gold bars. Rolex watches. Ten-karat diamonds. Porsches. These luxury items aren't what you'd typically associate Costco with, but Hamilton "Tony" James, its chair, says pricier items like these ...

"Since the beginning, we’ve always known we could move anything in volume if the quality was good and the price was great—Rolex watches, Dom Perignon, 10-karat diamonds," James said.