The Costco rotisserie chicken 2026 story is one of the most instructive case studies in all of American retail — not because of the chicken itself, though 157.4 million chickens sold in fiscal year 2025 at exactly $4.99 each is a number that defies rational comprehension — but because of what it reveals about the nature of member loyalty, the commercial power of an unbreakable value promise, and the lessons every roadshow brand should be absorbing and applying to its own Cost