A members-only store, funded by Wal-Mart, the world's largest retailer, opened in Southwest China on July 27. Called Sam's Club, the store is only open to shoppers with membership cards, Asia Pulse reported. Wal-Mart opened its first Sam's Club store and shopping plaza in Shenzhen in 1996. Shenzhen, in Guangdong Province, is one of the country's first special economic zones.