One SpaceX Starship will cost about $5 million as SpaceX will mass-produce nearly one hundred in 2021. Each Starship and Super Heavy booster will cost less than about $40 million.

https://www.nextbigfuture.com/2020/03/two-thousand-spacex-super-heavy-starship-launches-for-the-price-of-one-sls-launch.html