Warner's detailed some of the pre-order goods for Batman: Arkham City in the US.
Anyone who buys the game at Best Buy will feature a combo pack, while those who get it at GameStop, you'll get access to the Joker's Carnival challenge map.
There's also options to pre-order at Amazon and Walmart, but there's no pre-order bonuses there.
Batman: Arkham City releases on October 18 in the US and October 21 in the UK for PS3, 360 and PC. Watch the first gameplay trailer for it here.