[Isinlor]

SpaceX is contracted to deliver people to the Moon surface for 2.8 billion dollars total (development + actual mission).

To do it they need around 6 launches for refueling in orbit.

Therefore, the very upper limit on a single Starship launch is 0.5 billion (2.8/6).

And that's without development cost of Starship HLS.

Single SLS launch cost without Orion, including development, will be around 4 billion dollars.

20 billion overall for SLS development + 20 billion for Orion development.