Amazon is expanding its same-day grocery delivery service to 1,000 cities and towns across the U.S., the company said Wednesday.

Amazon tested same-day delivery for perishables in areas such as Phoenix, Orlando, Florida, and Kansas City, Missouri. It found that first-time Amazon grocery shoppers using same-day delivery returned to shop twice as often compared to those who did not buy fresh food.

Amazon is now rolling out a service where its Prime members can order their blueberries and milk at the same time as their batteries and other basic items.