A niece got PBK at Indiana University, went to Harvard Law, got first job at Cravath, Swaine, & Moore. Left for an MD, and has been practicing since then. Suspect she spent very little on tuition.
As a first grad student in math at Indiana University, I got paid for teaching, had a nice single dorm room, actually lived well, and saved some money.
There are a lot of buttons to push, strings to pull, to get low cost or free college, then free through Ph.D. Being a good student, good SAT scores, already know calculus well, all can help.
Point: Self study can work well. Obviously: Once a prof reading research papers, nearly always have to use self study, and the papers are generally much less polished than good textbooks.
So, I recommended to students short on money just to do some self teaching and show up, demonstrate what learned, and ask for a scholarship.
In the south, at least this is flat wrong