I found this dressin blue at http://shop.pacsun.com/girls/dresses/Dakota-Dress/index.pro
it appears Hansen surf has plenty of these as well.
You can get this dress in black at Dogfunk.com. It is on sale to!
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You can get exactly the same blue billabong dress at Ahlivv.com. That is where I got mine from. Here is the link: http://shop.ahlivv.com/Dakota-Strapless-Dress-p/bil20009dakb.htm