BM Dress HELP!

So I go into Davids last night and saw this dress
http://www.davidsbridal.com/Product_F3114153-F3114153_Prom-Dresses-View-All

I LOVE the color and the orginial dress I was looking at (black below) doesnt come in this color, its only for this prom dress.

Anyone know where I can find a dress in this color purple with the organza material?

TIA