Amazon launched a 30-minute delivery service in four US cities on Tuesday, offering fast delivery on items like produce, baked goods, electronics and even booze. I gave it a shot, and it worked out well. Amazon Now is available immediately in Seattle, Philadelphia, Dallas-Fort Worth and Atlanta and surrounding areas. The company said the service would be "rapidly expanding" to more cities, including Austin, Denver, Houston, Minneapolis, Orlando, Oklahoma City and Phoenix by the end of the year. An Amazon No ...