I’m moving this to the law school forum but leaving a redirect link from the graduate school forum. I genuinely don’t know whether an MA in philosophy will help you get into law school. My instinct is that it won’t necessarily, but I have seen in the class profiles of entering elite law school classes that a significant chunk of students do have other advanced degrees.
However, there are lots of universities that offer an MA in philosophy if you want one. Choosing one is a matter of choosing one that matches your scholarly interests as well as one you can afford. In order to recommend you universities, people would have to know what your philosophical interests are - and even that is difficult for people outside of your field. The best way to do this is to visit the websites of universities in which you are interested to see if they have MA programs in philosophy, or look at ranking lists of philosophy programs and see which ones have MA programs (there’s one called Philosophical Gourmet Report, although it focuses on PhD programs), or to look at philosophy papers and monographs that have come out recently and see where those professors are teaching.