You're right, it looks like the soundtrack was eradicated from the face of the earth, all the shops seem to be sold out.
Edit: Hold on, I think I may have found it, will report in a minute...
Edit 2: Not having any luck O_o
Edit 3: Wait I found it lol, listening to it now, will post in about 300 seconds
You guys better archive this, I have reason to believe this is the last source for these tracks on the whole interwebs.
Edit 5: Fail, the tracks are missing, owell. lololololololololololol On the positive side, I finally found a track I've been looking to find for more than 5 years =P It also has Tribes 2 - Wild Water.mp3, if that's what you're looking for =\
If I could find the dude's email I'd just ask him straight up.
Edit 6: My advanced hacking skills(lol) has revealed tim at score-music d o t com
Edit 7: I sent him an E-mail, you should as well.