How Walmart-owned Sam’s Club is trying to take on Costco’s private label Kirkland CNBCSam’s Club’s popularity with Gen Z may spell trouble for Costco Business InsiderSam’s Club and Costco are fighting to win over Gen Z shoppers FortuneKirkland Vs. Member’s Mark: Can Sam’s Club Ever Catch Up To Costco? CNBCAfrica.comSam’s Club is winning over Gen Z shoppers with convenience, and that could spell trouble for Costco MSN