I had tried to find the Oleg cassini dress CWG 365 which I fell madly in love with, but cant seem to find it. I feel so unlucky

But I also love a dress i tried on at DB, the
style # V3194 I loved it on me, and am willing to go for it instead of the Oleg Cassini one.
BUT I have a strict $450-$500 budget, so Im looking for it used.
Has anyone seen it? I need size 4P, or even 6 or 8 street size in IVORY.
Thanks