How do you figure it's royalty free? Did you find it somewhere and read it's license? Most music costs money. Some cues are very cheap, like those found on sounddogs.com...but then again, they aren't all that great either. Something this decent will cost, for sure. How much depends on how the final project it's used in is shown. Once in front of an audience? On the web? On TV? Domestic and international? Different tiers for different viewing options.