Hi Carla,
I'm originally from Kansas and attended a smaller state university in my hometown to the tune of about $1200 tuition/semester for my B.S. I covered that and more through scholarships and pell grants. When it came time for grad school, I applied to a couple of the accredited programs in my chosen field and ended up coming to the University of Florida. I received a tuition waiver and was paid an assistantship of approximately $18k/year. My only responsibilities were for fees (about $600/semester out-of-state, $300/semester in-state) and the general cost of living. Each state is different, and in Florida, you must be a resident for 1 year prior to attaining in-state tuition. I had to complete a declaration of domocile form with the city, register my vehicle and change my driver's license, etc. within days of moving here to ensure I could get in-state rates my second year. Some universities can give grad students in-state rates from the beginning if they are on an assistantship, it just varries.
With law school being a professional school, there's little that can be done to get around the high tuition. I believe the least expensive in the country might be the University of Arkansas at about $13k/year. Most either can pay it, or can get good student loans once admitted to a program.
Best of luck in his studies!