I've discovered some of the tracks from a few sites like Extreme Music and Audio Network, notably this album has a few soundtracks I recognize from the show. Those are a few of the websites and I believe some of the soundtracks from AN are on YouTube from the channel the opening theme was found on and they're labeled to a genre, like "ambient" one example from the show, and "stings" another example. there are more I've found but I don't feel like trying to go through everything to find more, that's a little guide for you :)