Where can you find through the fire and flames piano music?

Musicnotes.com definitely has the guitar (w/ tab) version of the sheet music. If they don't have the piano sheet music then it, most likely, doesn't exist (in any legal sense). Once you've found out who has the "rights" you'll know who prints the hard copy. You can contact them about any another instrumentations. My guess is that you'll have to settle for the guitar/full notation version and make your own arrangement because I don't know of any existing piano version.

-T

http://www.musicnotes.com/sheetmusic/mtd.asp?ppn=MN0063997

P.S. EMI owns the rights.