They are going to say that it's on order, but PPU does a seasonal run with these calibers. The best way to find out when they get it again is to "add to wish list" on their website. That way you will be notified immediately when it is back in stock.
However, they are referring to the Fiocci "8mm lebel" revolver Ammo. Which isn't what you are looking for.
People have asked the same question many times including myself and it looks like your best bet is to import it yourself because "8mm Lebel" (8x50) isn't imported by the distributors, despite requests.
Also, it seems to be on back order in the USA as well. Reloading or importing expensive Ammo will be your two options at this point.