I am a college student who does not have much spending money but do need help with my vocals and correct any mistakes that I am making. I had singing lessons before when I was much younger in a child's choir and I can hit notes and all of that but I do need constructive criticism and I need to know when I am doing things incorrectly.
Maybe Juilliard School of Music will have a bulletin board where you can look for teachers. Maybe some of their students want to earn a little money and can teach you for not much money. Or even a trade-you can help with their homework, or clean their apartment or something.