These companies publish the sheet music among other things to many of your favorite film scores. If you want to find if a score sheet is available for performance for retail purchase, this is a good place to start.

All Nations Music
BMG Music Publishing
Bug Music
Cherry Lane Music
Disney Music Publishing
EMI Music Publishing
Famous Music Publishing Company
Jobete Music
Leeds Entertainment
Lelber & Stoller Music Publishing
MCA Music Publishing
MGM/UA Music Publishing
MPL
Musikuser Publishing
Opryland Music Group
Original Sound Entertainment
Peer Music
Polygram Music Publishing
Rondor Music International
Sony / ATV Music Publishing
Warner / Chappell
Windswept Pacific Entertainment
Zomba Music Services