Is there any way to get a replacement rulebook without buying another copy of the game?

Mine went missing during a demo.

I'm not sure I understand the question. If a book gets stolen, you are responsible for replacing your stolen book.

 

If it was at a convention, you can contact whoever was in charge of room/event supervision and the security for the convention. They'll do bag checks, but you're SOL if you didn't write your name and contact information inside them (since there's no way of proving that it's yours without it). Other than that, it's your responsibility to watch out for your things. Sorry, bro.

You could try contact us, but the answer is likely to be no

I know it's not the official deal, but http://wyrd-games.net/community/files/file/16-kings-of-artifice-rules/ should give you what you need.  And then if it vanishes again, you can just reprint it.

Hippodruid FTW. Thanks. That will do me fine.