The SpaceX Starship will have six Raptor engines but will still be larger and cheaper than the external fuel tanks of the Space Shuttle. Elon Musk has a goal of building Starships for $5 million.
Two Starships per month would mean $37 million per Starship
One Starship per week would mean $21 million per Starship
Two Starship per week would mean $13 million per Starship
Elon Musk has tweeted out modifications for the SpaceX Starship that will be used for moon landings.