From December 17th, players in Europe will no longer be able to order a physical Battle.net Authenticator from the Blizzard online store. CM Takralus broke it down for everyone playing in the EU realms. Why are authenticators going to be unavailable? Because the online store in Europe is being revamped.
I admit I don't know how reasonable it is to order an authenticator from the US store for players in Europe, so hopefully the store won't be down for long. It should be noted that Takralus specifically points out that physical products will be unavailable, so presumably you can still buy items like pets and mounts.
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