Cassiohabib / Shutterstock.com Costco has the best business model in the retail game, beating out Walmart and Amazon. The wholesale warehouse has more than 90 million members. Costco deals are easy to come by, but we rounded up the bargains that are most worth your money. There's a reason Costco is beating Walmart and Amazon with the best business model in retail. A treasure trove for the savvy shopper, the wholesale membership-only warehouse has deals galore in its double football-field-sized space — enough to draw in more than 90 million Costcoholics and fulfill your wildest shopping dreams. It's no secret that buying in bulk will help rein in the cash flow.