My brother did make WAV rips of SOTN tunes and then burned them to CD long, long ago. I've got AAC rips of those two CDs with the extended tunes if you're fine with AACs; otherwise, I could try and get the CDs from him and re-rip to MP3.
Also, relatedly: I have the Haunted Castle OST that came with the Oretachi Game Center Zoku PS2 release of the game. Unlike the music that's part of the big box set, the music didn't go through any post-production. If anyone's interested, I could upload that.