What places in Manhattan that are affordable to live ?

ok i live in Bedfordstuyvesant with my mom and my two younger siblings and i am 21 years old. and i have a part time job at home depot which. i get paid 8.55 per hour and i know that i can't afford to move there right now. but in the future i plan on moving from brooklyn to manhattan. but i know that Manhattan is a expensive place to live and does any body knows any areas . in manhattan which isn't expensive to live at ?