As far as I've heard from a lady she is also making soaps by herself,she was buying her materials from Souq Waqef.... any way I'm not sure,but just go and ask by the shops directly infront of the main parking area.I saw there the black stone which we use as scrub for the heels.Maybe they have what you are searching for,or they can inform you from where you can get it....good luck!!
As far as I've heard from a lady she is also making soaps by herself,she was buying her materials from Souq Waqef.... any way I'm not sure,but just go and ask by the shops directly infront of the main parking area.I saw there the black stone which we use as scrub for the heels.Maybe they have what you are searching for,or they can inform you from where you can get it....good luck!!