How can I make money fast?

I want to buy this really pretty necklace on eBay that is an exact replica of the one on of my favorite characters on this on show wears. It is sterling silver and has a real gemstone in it, but here's the catch. It is $105, not including the shipping which is $10. So altogether it's $115 dollars. How can I make that kind of money fast, because there are only 10 left and the buying ends May 16th. BTW I'm 12, so it's not like I can go out and get a job.