In Kenya hearing aids can be obtained from a number of places, such as:

Beam Hearing Centre
Giants Hearing Centre
HASS
House of Hearing
Kenya Ear Foundation (Nyeri)
Kenya Society for the Deaf Children
Kenyatta National Hospital

A number of different organisations donate hearing aids. Here are some of the most well-known organizations:

Operation Ear Drop
Kenya Society for Deaf Children
Constituency Development Funds (via Members of Parliament)
Voluntary Service Overseas (VSO)
National Fund of the Disabled
Deaf Schools

References:

Kenya Society for Deaf Children, pamphlet.