2026会员店极限拉扯：山姆60店加速狂飙，Costco缓慢受锤

Group 1 - The core observation is that Sam's Club has established a stronger presence in the Chinese market compared to Costco, with Sam's Club's membership model becoming a significant part of the new middle-class consumer's shopping habits [2][3] - Sam's Club has been operating in China for 30 years and has surpassed 60 stores as of early 2026, supported by a mature "instant delivery" system that ensures popular products like Swiss rolls and roasted chicken are widely available in first- and second-tier cities [4] - In contrast, Costco has only been in the Chinese market for 7 years and has not achieved the same level of market penetration or brand recognition as Sam's Club [4]