Hi Janet,
Welcome to planDisney and thank you for stopping by with your question. I see you must have a
Mira, Royal Detective fan in your gang! I must say, "That's Genius!"
It is always difficult to know what will be available during any particular stay, however I have had my best luck at finding sought-after merchandise at two shopping spots at the Walt Disney World Resort. My favorite shopping spot is
World of Disney located in
Disney Springs. Fair warning ~ you might just find it hard to leave once you start looking around and indulging in your own personal retail therapy as you find so many things you never knew you needed! Another great shop to visit is
Emporium inside Magic Kingdom. Emporium is the largest gift and souvenir shop in Magic Kingdom so it will have the biggest selection in all of that theme park.
Since you are seeking a specific plush, I suggest asking a helpful Cast Member at one of these shopping locations for assistance locating Mikku and Chikku. Cast Members are very knowledgeable about where to find specific merchandise and may even be able to sprinkle a little Pixie Dust and let you know if they are at another location on property.
Best wishes and happy shopping!
Brenda