Need help finding a job (at 17?)?

I am 17 and currently do have a job but I need another one (Or a way to make more money for a car) I work at the public library only a mile from my house. I work Mon. Tue. Wed. and Fri. 9am to 6pm then Sat. 9am to 1pm. I don't work on Thur. nor sun. I need more money so I can get a car and other things I need. I'm in the Union County (TN) area. There's not alot of places out here and those that are hiring mainly hire family or during the times I'm working. HELP??