Ex post — any public university in your home state

Ex ante — any law school in the top ten.

Yale may be really expensive — but the extra money you make will more than pay for the extra cost. Some third tier public university may offer a law degree at a reasonable price — but your chances of passing the bar on the first try or getting a higher paying job when you are done goes WAY down.

University of California at Berkeley and University of Michigan may be the best bang for your buck (if you are a state resident).

Don’t just look at tuition costs. Look at their placements and their pass rate for the Bar as well.