I've been looking for since the first games after the East and he has recently become available at Amazon.
My favorite is "You should do as he says," which is also played if the game disc is inserted and you only go to the game Eicon. This song I wanted to have and sometimes did just so the disc inserted and not start but simply let the song run for a long time.
Not without reason is Batman Arkham City, the action game 2o11, game and Soundtrack.Wer on Batman and on OST's is who needs to access easy here.
Just a pity that there is not a proper CD to OST ... That would still rather have been, I'd still above what it paid for ...