In Batman: Arkham City (2011), you can find Harley Quinn's outfit from Batman: Arkham Asylum (2009) in Joker's Fun House, complete with Warden Sharp's ID tag. : r/GamingDetails
Life-Size Harley Quinn Replica From Batman: Arkham City Revealed
DC Comics Batman Arkham Knight Harley Quinn Action Figure : Amazon.co.uk: Toys & Games