For law or business it might be worth going to the prestige school, because in those fields it’s who you know that counts.
For example, it was worth billions to Steve Ballmer to have been Bill Gates roommate at Harvard.
For law I think undergraduate school is surprisingly unimportant, but law school prestige is critical for many jobs (and there’s a huge salary difference between the good law jobs, the mediocre law jobs, and the bad law jobs—though at bad schools students are lucky to get any jobs). The best bet for this may well be to get a cheap undergraduate degree, provided the education is decent, and then go to a good law school if possible given grades and test scores (and if it’s not possible, probably avoid law school at all).