How can I fix my camera?

My mean a*ss sister (I WANT TO KILL HER!!!) broke my $300 camera. I was just going to list it on eBay today too! I had everything ready and I was just about ready to take the pictures for the listing for it on my other camera that I'm not selling. She grabbed my camera and threw it. The bottom battery cover door snapped off and the battery fell out. The battery is fine but the battery door completely snapped off. Now I can't sell it!!! So how much does it cost to fix it? It is a Casio Exilim EX-Z700.