Wall Street Journal:

Sources: Amazon is testing its cashierless technology for bigger stores, leading to speculation that it may use it one day for its Whole Foods chain  —  Online giant tries to overcome challenges caused by retail spaces with higher ceilings, more products  —  Amazon.com Inc. AMZN .99% …

Sources: Amazon is testing its cashierless technology for bigger stores, leading to speculation that it may use it one day for its Whole Foods chain (Wall Street Journal)
Source: Tech Meme