Disney Japan released a set of Big Hero 6 Tsum Tsum on March 3rd (Japan Only) and almost all of these adorable characters sold out immediately. Crowds lined up outside Disney Stores in Shibuya and Maihama to get their hands on these.
As of this writing, on the Disney Japan store only Baymax was available. All tsums are now sold out online as well. Hopefully, Disney Japan will release more stock.
Please note that these are only available at Disney Stores in Japan. The online store will not ship outside of Japan. Photos are from Japan Disney Store Website.