Beauty And The Beast Dresses

Where can I find resonably priced long formal dresses under $150?
I am going to a formal ball and I am having a hard time finding a Long formal dress. I have been to all the department store and I am not finding anything I like. It seems like all the long dresses ouy now are those big puffy/wavy “bell” dresses like the one she wears in beauty and the beast.
I just want a black polester/satin long dress. Any suggestions a websites with affordable long formal dresses and reasonable shipping?
Thank you!
Promgirl:
http://prettyprincess.us/dress-up/prom-girl-prom-dresses-homecoming-ball-gowns-formals/#clothingShopping
They have an under $100 section
