Back to school

I applied to PhD programs in microbiology/related last cycle but didn’t get in anywhere. So I decided to get a masters to improve my stats since undergrad gpa was low. I’m in a program at one of the cal states and it seemed within my price range without any loans. However I lost my job weeks before the semester started and I guess by then it was too late to get loans or any financial aid. I have until Monday to pay off my balance to register for spring semester and I have no idea what to do. Any suggestions? I owe about 3k