After a couple of months on hiatus, the Blizzard online store has re-opened its doors as Blizzard Gear. Not to be confused with the digital-only Battle.net Shop, the Blizzard Gear store is where you'll find the usual assortment of shirts, posters, plushies, and other Blizzard memorabilia. There's also a new section titled Caverns of Time which sells leftover items from past BlizzCons. Perhaps most relevant to WoW players is the ability to get your hands on a physical authenticator once again, which is available in a few different flavors. According to their shipping page, they will ship most of their products to a number of countries outside of the United States.
You can visit the Blizzard Gear store here.