STS flight cost

Very much FWIW. No indication how the number was derived.

http://www.newscientist.com/article/...ial-units.html

23:06 22 June 2009

NASA recently calculated that converting the relevant drawings,
software and documentation to the "International System" of units (SI)
would cost a total of $370 million – almost half the cost of a 2009
shuttle launch, which costs a total of $759 million. "We found the
cost of converting to SI would exceed what we can afford," says [NASA
spokesman Grey] Hautaluoma.