The store holders at the little souvenir shops around Livingstone are very good. They'll usher you in to their stall, "come in my sister, I show you what I've made. Looking is free, touching is free" and "ten different families rely on this one store, my brother made this, my grandfather paints these, nobody has bought anything this whole day, how about something small?" It's very effective.
They also try and connect with everyone personally - "Where are you from? Australia? Down Under! G'day mate! You are from Sydney? No? Melbourne? No? Perth! You are from Perth! No? Then from where?"