As said in the title, you now can preorder the Reunion Tracks / Final Fantasy VII : Advent Children Complete album from Play-Asia !
You can get it right here for US$ 26.90.
Release date : September 16th, 2009.
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Source ...
Could you find the page where it is registered ?
Maybe it has been updated with a platform... ^^
I know it was planned during the E3 2006 to release the game for PSP, in the USA, but i don't know anything other.