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So Winchester is one of "the odd, mostly non-exporting, U.S. manufacturers"?
They produce it in their Platinum Tip and regular Super X lines.
If you checked around at local stores they might be able to order it in if their suppliers have any.
Personally, for such a difficult-to-find (but not impossible) cartridge I would seriously consider handloading.
In the 5 years I've had my BlackHawk, I've seen ammo once in store @$56/box and maybe twice at a show..for not much better. It's the reason I started reloading.
Clint