This is only valid where Prime Now is available which is limited to select cities:
http://www.amazon.com/b?ie=UTF8&node=10481056011"We're currently offering 1-hour and 2-hour deliveries in Manhattan & Brooklyn, Baltimore, Atlanta, Miami, Dallas, Austin, Houston, Indianapolis, Chicago, Seattle, Portland, Los Angeles, Minneapolis, San Francisco, San Jose, San Antonio, Las Vegas, Sacramento, and Phoenix."
