The online retailer is now delivering groceries to 5,000 U.S. cities and towns, including thousands served by same-day delivery where customers can shop produce and other perishables along with staples. Based on strong customer feedback, it said it plans to expand its same-day delivery service of fresh groceries to more areas this year.

Still, Amazon pledges to continue to experiment with new physical store formats.

The company revealed on Tuesday its plans to open a “new supercenter” physical retail concept designed for customers to shop Amazon’s broad selection across fresh groceries, household essentials, and general merchandise. The company didn’t provide any other details including the timing of the opening.

Amazon also is testing a new in-store format called Amazon Grocery, which it launched alongside Whole Foods Market in Chicago. This concept at Whole Foods Market in Plymouth Meeting, Pennsylvania, lets customer also shop for groceries and household essentials from Amazon

Amazon opened its first Amazon Go concept in 2018 in Seattle, letting shoppers take milk, potato chips or ready-to-eat salads off its shelves and just walk out. Amazon’s technology charges customers after they leave.

It said that it’s gathered valuable insights along the way.

For example, its Amazon Go locations served as “innovation hubs” where it developed “just walk out” technology-now a checkout solution operating in more than 360 third-party locations across five countries.

Amazon said it expanding its “just walk out” technology to Amazon’s own operations, with more than 40 North American fulfillment centers using it in breakrooms today, and more planned for 2026, helping employees grab meals without checkout delays.

Amazon introduced its first Amazon Fresh physical store in 2020. The stores features an assortment of national brands and produce, meat and seafood.