Ship sale prices can exceed size of text boxes.
Put a ship of mine in the store as a mod, didn't expect it to overflow the price window.
Largest number you can have before it cuts off the last digit is 999million
My ship got calculated as 1.2-1.5 billion. I know people have made bigger and heavier ships too.
Attached is screenshot. mod can be found at https://steamcommunity.com/sharedfiles/filedetails/?id=1815363562