Pentagon Federal Credit Union currently has a 2.99% interest rate deal. Their normal rate is 3.99%. If you're not eligible to become a member by its normal criteria (military, family member in military, etc.), you can pay a nominal one-time fee and become a member of the National Military Family Association which then makes you eligible. I have used them for 3 auto loans, and have nothing but great things to say about them.
http://penfed.org