Oleg Cassini Dress K2000

I am looking for an Oleg Cassini dress style K2000 in white, size 14. I found it at David`s Bridal, but its $850.00. I do not want to pay that much money for a dress that I will only wear for one night for a couple of hours. Yes, it is my wedding day and it only happens once, but I am on a budget. Please e-mail me at n_perret@hotmail.com if you have this dress or know where I can get it for less than $850.00. Thank you.