Howdy!
As I read previously on this board: THE DOLLAR STORE IS YOUR FRIEND!
I just found some great unbreakable shaving bowls with water tight screw on lids...
Ready...
Crayola® Insulated Containers (for kid-size soup in a lunch box maybe?)
A 3.25 oz / 100 g cake of shaving soap fits neatly in the bottom.
It beats the $12 I paid for a Schöne Stainless Steel Half Hemisphere (which won't contain the soap very well when traveling...)