I Need A Monique Lhuillier Gown Lace 6-10

Hi! I am interested on purchasing a Lhuillier lace gown, whether new or gently used. I like the all lace gowns, preferably one piece. I do not know the specific names of most gowns, but I like Valentine and Scarlet for sure, and #5 of the Spring 2006 collection (on moniquelhuillier.com). I am on a small budget and would prefer an authentic gown over one made similar. $850 or less.
Thanks