So yeah, I'm happy now. Finally arrived, and now I'm the proud owner of a 142 page score book. It's got full piano scores for every single song in Chrono Trigger(even the unreleased Singing Mountain). While it's not as awesome as full score book would be, I can live with having piano scores.
The only downside is that all the text is in Japanese, but it's got standard notation that's perfectly readable regardless of language. Now if only I could find a reasonably priced copy of that Chrono Cross piano score book, but it's out of print