It would take fourteen launches to get over 800 Starlink satellites. These 60 satellites are prototypes which may not be good enough for the commercial service.
Each Falcon 9 launch will cost SpaceX about $30-40 million. SpaceX charges $50 million for each launch but SpaceX has a profit margin. Each Starlink satellite will cost about $1 million to launch and likely costs about $1-2 million to build.