I would shop around for the best interest rate, and start with lenders you have an existing relationship with. That's probably your bank or credit union. Does your school's financial aid department have any leads? Some schools have relationships with particular lenders.
Now would also be a good time to consider if continuing your education immediately is the best plan for you. Private student loans don't have the same protections as federal loans, and are very difficult to handle if something goes wrong and you cannot make your payments. If you've exhausted your federal loans, you've probably already got a substantial debt burden, are you going to be able to comfortably make those payments when you graduate? If not, can you do something to avoid the need for more loans? Like taking a semester off to work and apply for scholarships?
