Bad Credit Student Loans?

I have bad credit and need additional loans for school this year. I've tried 3 co-signers with no luck and I don't qualify for a loan on my own. Does anyone know of any loans for students with bad credit. I already have Stafford loans and they don't cover nearly enough. I need about $25,000. I don't have time to apply for grants and scholarships as school starts in two and a half months. Unless anyone knows of any that are really quick.