You haven't even come close to maxing out your opportunities. It's not to late in the game for mid-size firms. In fact, a lot of them haven't even finalized their SA program yet which means they haven't started interviewing yet. Go to lexisnexis.com/lawschool/career and search for mid-size/small firms in your area and start calling and sending out resumes. Good luck.
Mid-size firms are still hiring, for sure. If you're serious about not getting the SA money, you should work for a judge--I did this my 1L summer, and I LOVED it. Try to find a judge who worked in another government branch before being appointed, because he may be able to hook you up.
Well, it's officially mid-November, and I got nothing for next summer.