The service, which was available in the New York and Los Angeles region, has been expanded to 15 more cities close to Amazon's fleet of distribution centers. Amazon Prime members who order a product as late as Friday can receive their item on Sunday via USPS, which has partnered with Amazon to make the deliveries.
Amazon's Mike Roth, vice president of North America operations, said that "millions" of items had been delivered using the service and that most of the items seemed to belong to people's weekend to-do lists.
"So far, the most common items delivered on Sunday include baby supplies such as newborn apparel, books and toys -- Sunday delivery is clearly crossing errands off the weekend to-do list," said Roth.
If a customer is eligible for for Sunday delivery they will be notified when they put their product in the shopping cart.
This is another attempt by Amazon to make the shopping experience more convenient for their customers. Amazon CEO Jeff Bezos announced the company is working on its events and eight generation of Prime drones, which, pending regulation from the Federal Aviation Administration, could make deliveries starting in 2015.
The 15 cities where Sunday delivery is now available are:
College Station, Texas
New Orleans, Louisiana
Oklahoma City, Oklahoma
San Antonio, Texas