Places To Shop To get Prom Dress?

Hey. Im looking for a prom dress and graduation but an 8th grade type but not too babyish. Deets: Im full figured. I have a huge bust and a butt and bell lols.. I wanna go with something plus size.Also im tall so cant go with too short. Where in manhattan do they sell plus size dresses. Please no place thats like $200 and them. Like a 100 or less. Proms in 2 weeks for me:( Im wayyy behind. So where in manhtatan sell plus size prom dresses. Some suggestions for other places would be nice too. Thank you in advance .***not really looking for best answer will check out all ans. dont really care about best answer******** In case I gots u confuse>>>>Im tall, err big. would need something plus size