Where to find prom dress?

I have tried a bizzilion stores both online and not, and i am out of places and i have basically nothing in my price range that i love. I was pretty close to buying this dress:a href="http://www.dillards.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=301&langId=-1&storeId=301&productId=501795461&view=80&N=1601735&searchUrl=%2Fendeca%2FEndecaStartServlet%3Fview%3D80%26N%3D1601735&R=02933045" rel="nofollow"http://www.dillards.com/webapp/wcs/store…/a but my mom vetoed it last minute, because she believes the v-neck is too low(i have a pretty large bust), and dilards did not have the dress in stock. I absolutely love this dress: a href="http://www.scalausa.com/p-491-scala-7874.aspx" rel="nofollow"http://www.scalausa.com/p-491-scala-7874…/a but its 200, and my max is 150/160ish. Does anyone have reliable websites, that ship pretty fast (prom is on march 26th), with reasonably priced dresses. or has anyone seen dresses similar to the dresses i showed above.I am kind of freaking out.