Victoria`s Strapless Gown Wanted, Please

I am looking for a Victoria`s bridal Ritz Informal gown, style 518. It is strapless, with corset-tie back and a gathered front. A similar gown would also be considered. I would prefer a gown without a train or with a detachable train. I am a size 10 -12 usually, but the corset gown style should fit me up through size 16. Please let me know if you have such a gown for sale. I am looking for a used gown or a store sample. Thanks very much. -Alison