Found Lost Ruins of Arnak at Kmart (Sunnybank) for $49 while looking for Carcassonne. It's no longer on their website but if you search for "lost ruins of arnak kmart" it does show on google as $49.
Currently the game is 8.1 on BGG, ranked 29 overall and 3 under the family category. Lots of great reviews on BGG.
According to OzBargain's history it looks like we typically grab this game at $60 so this does seem like a good price.
Good luck finding it in your local store. Please let me know if this post does not fit the guidelines.
What kind of game is this OP? What would it retail for elsewhere?