After waiting far too long I'm finally able to offer up my "At the Mountains of Madness" prop map.
This is a 17.5" x 22.5" map of Antarctica based on the one done by John Bartholomew for the 1922 "Times Survey Atlas of the World". I've cleaned up some dirt and a few small tears and corrected the color registration, but the weathering along the edges was left intact because I like the way it looks. The level of detail in the map is absolutely stunning. Unfortunately, that also means the file is gigantic- 89 megs.
You can download it over here.