After just a month open to the public, the early success of Amazon Go may spur the opening of six more locations by the end of the year, multiple people familiar with the matter told Recode on Thursday.

Some stores are likely to open in Amazon’s hometown of Seattle, and others may settle in Los Angeles, although it is unclear if stores will open in other cities, according to the report, which also states that Amazon last year had identified at least three additional locations for Go stores.