Isn't $90-100 pretty standard for a new console game release in Australia?
I don't know why Wastelands 2 is cheaper, or much of the details of what was changed in the Director's Cut, aside from what is listed on wikipedia. For a rough comparison, though, Wastelands 2 added 8000 lines of voice acting, while the EE added 88,000. Wikipedia mentioned redesigned encounters, but no details; for the EE, all encounters were adjusted and the tactical mode has redesigned combat (including changes to enemy placement, composition and AI). The EE also has a rewritten ending, and additions and changes to quests and dialogue throughout the game.
