I'll add to this in time; first up a $5m novel rights example with Scorsese and DiCaprio attached - screenplay adaptation could cost the same again depending on how many writers are contracted to draft it:
Rights to Flower Moon – as it’s known to industry insiders – were snapped up by Imperative last year for a reported $5 million, and a script has reportedly been drafted by veteran Oscar-winning scribe Eric Roth of Forrest Gump and The Curious Case of Benjamin Button fame.
...
