R.D.
AHHHH MAN I CAN'T THINK OF THE NAME OF THE WEBSITE!!
There was this website I was on when I was looking for my wedding dress, something like 'once worn' or 'second hand' wedding dress dot com... it was a website completely based on buying/selling used wedding dresses, it was a great website...
If I think of it, I'll let you know for sure :)
ETA: FOUND IT!!:
http://www.preownedweddingdresses.com/
:)