digitaleraser is selling a limited edition Batman Arkham City Collectors Set. These sold quick when they dropped, probably because of all the exclusive extras.
A custom Batman statue produced by Kotobukiya.
An art book.
Batman: Arkham City album from WaterTower Music including original songs by hit artists (available via digital redemption).
Bonus DVD featuring the animated film Batman: Gotham Knight.
Early access to the “Iceberg Lounge” Challenge Map.
“Batman: The Dark Knight Returns” skin.