Now you don't.
This website has terrible MIDI renditions of the theme songs of almost every movie ever made.
As well as having an entire section devoted to Arnold Schwartzenegger movies.
Check it out- it's already helping me out a ton.
I think I'm going to pre-collect a set from there so I'll have a ready pool to draw from.
I did that a while ago with everybody's favorite http://www.vgmusic.com which has midi adaptations of every game from Mario to Brain Age.