I think there is a site called soundtrack collector that might list any sellers in the U.S. that are selling that particular version of the score (if any). I wonder if that version you like is in the public domain?I find it odd that Amazon even offers a digital only version of something with no corresponding physical copy available. I get it that some indie artists only release their music digitally, but I don't have the feeling that this particular one is an indie artist in that same respect.
I guess I'll keep looking or eventually resign myself to the MP3 if I decided I really want it. But for now I can stream it on Tidal.
I know what that soundtrack hunt is like. Hope you find the cd.