Where can I order the perfect homecoming dress?

This homecoming will be my very last homecoming so I want my dress to be extra special. I also want it to be very romantic because I'm taking the most amazing boy ever. This is why I am thinking of ordering my dress online, but I have never ordered online before and I need to know of reliable websites. The dress I am looking for I would like to be short, pink, and i want it to twirl when i twirl =]. Also, I don't want to spend over $100 because, my family is on a tight budget this year with my graduation, prom and my sister's wedding.Just post the URL's of any dresses you might think i will like and that fits my criteria, thank youuuuu =]