Found it....
A report from NASA’s Office of Inspector General released in November 2021 outlines just how much development costs increased for SLS between its first iteration and now, and revealed how expensive each SLS launch will be. According to the report (opens in new tab), NASA will end up spending a total of $93 billion on the Artemis program between 2012 and 2025, and each SLS/Orion launch will have a price tag of about $4.1 billion.
$4.1B, DOUBLE that number and you might be close. Same BS used in the 70’s to convince Congress that the Shuttle was Cheap and Quickly turned for next launch. I think their estimate was off by a factor of 4 and Quick turn ended up being just under a year for only the last launch. Lots of issues with the Tiles staying on.