I have the same problem.
Operating System: Ubuntu 14.04 64bit German
Game is from Gog and English
I have already made some progress in the game (about 8 hours) and now I would like to know if the fix that is prepared by Obsidian will prevent the bug from happening in the future or if also my existing savegame will be fixed?
The wrong prices must be included in the savegame file, as I tried to send it to a friend, but when he opened it he also had the high prices.
I need firewood desperately, but it is quite hard to get in this part of the game apart from Gilded Vale.