Mine cost £1 from ebay. It was from China so a bit of a wait.
As it is reusable, it would be good for girls from poorer families.
In fact , why arent they promoted in general??
I guess there are a few drawbacks...can be a bit messy . I would never wash them in a public loo sink but they dont need to be washed everytime they are emptied.
Tmi sorry.