Recent AI adopters include Sam's Club Inc., the warehouse retailer owned by Walmart Inc., and Giant Eagle Inc., a regional chain of grocery and convenience stores. Giant Eagle said last month that it would test a technology similar to Amazon Go's at a convenience store in Pittsburgh, where it is based. Several companies that sell cashierless technology--including Standard Cognition Inc. and Vcognition Technologies Inc., which does business as Zippin--said they are working with U.S. customers but declined to give details. Sam's Club plans to offer AI-powered cashierless shopping later this month at a 32,000-square-foot store in Dallas, a quarter of the size of its average store. Once the AI system is in place, customers will use their smartphone cameras to scan the product itself.