How can I make money?

So I am a current college student. I just moved into an apartment for my second year and for summer school. The problem is that I don't have an income of any sort. The money I have now and the financial aid for the summer might be able to cover rent and food through July or mid-august, but after that I have nothing. I have been applying for jobs everywhere and going to interviews, etc., but no luck. I have no car, so I cant really travel far to work, and I have summer school, so I have had to decline a couple of full-time positions already. My parents are struggling with their own finances, so I can't exactly ask them for anything. I really don't know what else to do. I've tried selling a few things online to no avail. I've taken out as much financial aid as possible. Every day I scan the ground for any lost treasures. Can anyone help??? Please and thank you!