Here is a couple of the better MP3's that I've found.
http://download.dmusic.com/mp3/binladen/WTC%20-%20Osama%20Bin%20Laden%20Dead%20or%20Alive%20From%20KSEX%20Radio.com.mp3
http://download.dmusic.com/mp3/binladen/jackyl%20-%20open%20invitation%20(to%20osama%20bin%20laden)_Ihateyou.mp3
http://download.dmusic.com/mp3/binladen/KOMP%20Rock%20And%20Roll%20Morning%20Show%20-%20Bin%20Laden%20Bomb%20Song.mp3
http://download.dmusic.com/mp3/binladen/pulsarbeat%20-%20kill%20bin%20laden.mp3
A complete list of songs can be found here. http://www.dmusic.com/news/news.php?id=5866