Tron soundtrack?

Hey, can anyone tell me a quick and efficient way to get the whole Tron soundtrack (because apparently there's like the regular release and then like four tracks on a special edition and then like 2 tracks on an import or something confusing?). Yes, I'm asking for the actual legal, pay for it way -- I just need a handy iTunes download list or explanation of what track is where to deal with it?

Merci.

(yes, it seems I'm using LJ as The Google now, sorry).