Amazon on Wednesday announced a new service that will allow Prime members to receive in-home delivery of packages with the help of high-tech smart locks that allow drivers to open their front doors. Amazon Key will launch officially on Nov. 8 in 37 U.S. cities and surrounding communities, with additional locations to be added over time. The service will be available at no extra cost to Prime members, and it will work with standard, two-day, overnight and same-day deliveries. Customers can track the delivery using the Amazon Key mobile app.