Have you tried anthropologie's online bridal shop? I bought my BM dresses from them and i fell in love with so many bridal gowns
I took the liberty of looking around the site for a similar style dress to yours and found these:
I have been obsessing over this dress for quite some time now, and finally it's time to make appointments to go shopping in NYC ( I'm from Boston) so I wanted to make sure they had the dress before I went... discontinued, heart broken. Not sure I can get it out of my mind... I do have a few others that I like and will be trying but really had that gut feeling about this one.