Researching Auto Loan Interest Rates

I was talking to my brother this morning about getting a new car for my daughter. She is going to be graduating from high school and has always had excellent grades.  I promised her that if she kept up with her schooling I would buy her a car.  She has a job and will be able to pay for her insurance and gas but I will make the car payment for now.  My brother gave me some suggestions on where to start looking for Auto Loan quotes.  He is pretty knowledgeable when it comes to finances so I know he will help me to find the best deal.