Amazon is launching a new one-our delivery service for impatient customers called Prime Now. The service will be available in select areas of Manhattan starting today, with a larger rollout planned next year. Two-hour delivery is included with an Amazon Prime subscription, but customers can spend eight dollars to have orders delivered in an hour. Prime Now is Amazon's latest effort to boost the value of a Prime subscription, which now costs 99-dollars a year and includes free two-day shipping, video and music streaming.