Asked Africom your question and this is the response they gave:
We currently have a handset going for $50, and we will continue to search for cheaper alternatives. We also now have a dual sim handset which takes a CDMA and a GSM line going for $145.
For businesses however, we allow them to get handsets at 0% deposit (I mean the cost of handsets can be spread over a period of time) after passing credit vetting tests. By business we include even one man SMEs, THEY DO QUALIFY FOR THE SAME.