Yes, Joker Greeting does have some retail partners in other countries. See below for a list of partners. This way you can save on shipping and duties!
Australia
Spicy Baboon has a variety of Joker Greeting items
Austria
U.K.
Firebox.com - They carry a few Joker Greeting Items
Netherlands
AB Vitality - Christmas Card
AB Vitality - Birthday Cards
Paris
L'avant Gardiste (they only carry the Birthday Card)