All prices in stations have doubled with what seems to be no correlation between station stock nor faction reputation.
The 5 images attached show a Renegade station yesterday, the same renegade station today, a monolith station today, the difficulty settings, and faction reputation/fame.
The only change I am aware of between now and the time the screenshot of the renegade station taken yesterday, is a fame level increase.
(Marked as major incase it's actually a major bug)