The Rokinon 21-28-32mm (3 in 1) pancake lens ins now in Stock at Amazon
This new and extremely unique 3 in 1 pancake modula lens is now in Stock at Amazon US (Click here).
Here is a review of this strange setup:
As an alternative also consider this:
This new pancake lens already became a popular seller at Amazon US, BHphoto, Amazon DE, Amazon UK, Amazon IT, Amazon ES, Amazon FR, Pergear, Viltrox.