Online Supplementary Careers?

I'm a high school student, and due to my family's financial situation I am going to have to contribute a great deal to my college tuition. I am already working two jobs, as a grocery store cashier, and as a busser. I've been looking at becoming a cha cha guide, but aside from that I'm not able to find any moneymaking avenues online. Any ideas for how I could make a little extra cash?