How else can I get more money for a new camera?

I can't get a job until a month from now because I'm only 15, and I really want this camera. My mom is happy about be wanting the camera (Nikon D5100), and is offering to pay some part of the money, and my dad, but I still have about 500 dollars to get (At Best Buy with the warranty and everything is 1, 110 dollars), I'm cleaning my sisters house next week for 50 bucks, but I still need money. What can I do?

Wait till Christmas? Babysit? Become a local photographer's assistance (Kind of an off-the-radar job)?

Babysit, walk dogs, mow lawns, yard work, pet sitting

Learn patience! It is a valuable lesson, you do not need the camera right now. You lived this long without it, you can live a few more months. Perhaps by the time you can work, a better camera will be available at a lower price.