I think the Volt colorways are selling out because of the Olympics exposure, it's the only colorway the US Olympians wore. I've been reading that Niketowns are getting re-stocks now so it seems I still have some hope.
Outside of the black&white colorway I tried to order from Finishline last week:
I hope to find a pair of this white/black colorway too, it would be much better if Nike put black soles on these though:
They also have a colorway for NYK fans?