I purchase mine on eBay... I use Dudu Osun.
Word of warning: this is serious stuff!!! Use gently or you'll end 'burning' this skin! (Think mini chemical peel)
I'm not sure WHY or HOW this soap works but it transformed my acne skin!
Now the transformation is not over night, it's not a miracle worker! But with daily use my skin looks amazing! Rosy cheeks, improved skin-tone, no more acne outbreaks! With the exception of the occasional hormonal spots My skin is flawless!
A bar lasts FOREVER! so total value for money!!
My advice: only use it every other day the first two weeks just so your skin can get used to the effect, then use it more and more... I use it twice daily now.
It's very drying so invest in a nice moisturiser for straight after use