Word of mouth. I have just realized that everyone has a talent, so you should ask friends and family, who does nail, who does make-up, who does hair, etc, I am sure many people will be more than happy to help you. Ask someone with a nice car to drive the girl to the prom, do not rent a limo and ask for dresses and shoes from someone rich you know, there are people that have more shoes you can imagine. I can lend you a black sandals ( just wore once), number 7, no problem. Go to TJ Max or Ross. Please do not put on the plastic, it is insane and you know what, nobody will even talk to you the week after, school is over anyway, who cares, go have fun!