We have not yet had anyone who has declared that they have built or used microscopes in Botswana (Where are you? (OFM location survey) - #100 by j.stirling). I gather that you are planning to do the printed parts yourself, so this is about the non-printed parts? Some of the vendors listed on the web site do ship parts internationally.
We have tried as far as possible to choose parts that are widely available. The Sangaboard is unfortunately a custom board as there is nothing suitable that is widely available. The condenser lens is widely produced as a commodity for OEMs, but can be harder to get in small quantities or from local suppliers. In your other posts you have mentioned malaria. This requires high resolution and careful attention to the illumination as well as to the objective, so you do need that high NA condenser lens.