I just found the dress I think I am in love with (I still want to try on more). The store retails it for $2120. A friend advised that I should look elsewhere and price compare, so I did a quick google search and found the EXACT same dress for $326 (at the lowest and many in between). How do I know that this is an authentic from the deisgner and not a replica? That the site is reputable? And how can they sell a dress I just saw at a Trunk show for nearly 1800$ less??