What's a good price for a prom dress?

I didn't get to go to my prom. My neice just went to her prom Saturday and my Mother in law bought her a dress at Town and Country Fashions for $1000. I think that is outrageous! My neice isn't worthy of such an awesome Grandma.

4Ronna JonesFort Worth, Texas
    I didn't really want to go to my prom, I went cause my dad wanted me to. He bought me a beautiful dress that was peacock colored and was around $400. I thought it was a bit much but he wanted that for me. I'm thankfully for a father who cares more about memories and fun instead of money. I didn't even have a prom date lol I had a couple to ask me but I said no I wanted to go alone.
      4Ronna Jones
      I know my weddings gown didn't even cost that. I think my wedding gown was almost $800 with altering and cleaning.
      About Ronna Jones
      Born: San Antonio, Texas
      Current: Fort Worth, Texas
      Birth: December 24
      On Moms.com since: Nov 6, 2013
      I am a stay at home Mom of 3 handsome boys and 1 beautiful baby girl. We are now done having children. I Love being a Mom and a Wife. I have been married since June 20th 1999.