How much does a SpaceX Falcon 9 launch cost?

How to get close to this number

Anchor on the previous generation. The explanation gives it: comparable launches routinely ran past a hundred and fifty million before reusable boosters. A price roughly halved from that is the answer, and anchoring on a known predecessor price is the standard route.

Reusability is the entire explanation for the difference. The first stage is the most expensive component of a rocket and was historically discarded on every flight; recovering and reflying it converts the dominant cost from a consumable into an amortised asset. Nothing else about the vehicle changed nearly as much.

The longer-run figure in the explanation is the one that matters: cost per kilogram to orbit has fallen by more than an order of magnitude since the 1980s. That single number is why satellite constellations, commercial space stations and the Starlink question on this site all became possible within a decade — the entire industry is downstream of one cost curve.