Researching information on Namibia to update the Electoral Systems and the Personal Vote database, I found this EISA report with some information on party funding and disclosure regulations which includes:

Namibia is one of the fourteen African countries that provide public funding to political parties…

This contribution was judged by International IDEA to be too marginal to make a significant difference in the electoral process…. Moreover, in view of the vast size of the country and its dispersed population this contribution is deemed extremely helpful in supplementing the cost of transportation, which remains the biggest expenditure item at times of elections.

…Although parties are required to disclose all donations in excess of N$500, Namibia does not have an elaborate legal framework for regulation of private contributions to political parties.