Well, from Watchco maybe...Omega still makes and sells the case. Note that this WTB post is a rule violation...but the case you are looking for is actually a 166.0324...
Is there any place else that carries this, cousinsuk requires a international wire bank transfer to purchase.
I bought my case from them, and paid using wire transfer. No issues. And small correction, it is not a WatchCo case, it is Omega service case. WatchCo just has access and buys them from Omega.