Go to playasia.com if you want the Japanese one which is region-free. That's what I'm going to do if I don't have any luck. I've only put off buying Snake Eater 3D because they are hard to find but they are more plentiful across the lake.
Nintendo 3DS Friend Code - 1289-8243-6472
Luigi's Mansion 2, Mario Kart 7, Kid Icarus Uprising