Student Financial Aide?

I am a senior who will graduate in December of this year if I can attend this one summer cl. In the fall semester of college I will be student teaching. However, I can not get any more financial aide help. I have tried A LOT of sites like Sallie Mae and private loans, but I need a co-signer which I don't have. I tried going to the banks, but the denied me a personal loan. It seems I am backed against a corner wondering how I can get help/afford this one summer course. Any advice or suggestions would be very very appreciated!