Figured even if this got asked months ago I would answer this question....
"When The Tigers Broke Free" which was originally featured on the film adaptation of "The Wall" released as a single and was to be included on the the album "Spare Bricks." But then suddenly due to the Falklands War then Roger Waters developed "The Final Cut" album as his response to the situation and his thoughts about people in power such as Thatcher and Regan.
In 2004 for some odd reason it was inserted into a remastered reissue of "The Final Cut" album between the tracks "One Of The Few" and "The Hero's Return." The recent 2011 "Why Pink Floyd?" remastered reissue also has this as well. "Echoes: The Best Of Pink Floyd" also has the song on disc 2 but I say get the 2011 "The Final Cut" reissue since its the best sounding version you'll find on CD (or digital download). Not to mention "The Final Cut" at least in my opinion is one of Roger Waters best works since honestly its really a Roger Waters solo album but released under the Pink Floyd name due to David Gilmour insisting on it despite Roger wanting to release it under his own name.
Odd note about "The Final Cut" album is for whatever reason we still have not gotten a digital release of "The Hero's Return (Part 2)" or the hysterically badly censored "Not Now John."