Rather buy from Thomann if you want to import directly from Europe.
Amazon had the RME DAC in stock for quite some time that does ship to South Africa, its only very recently that it has been out of stock, so give it a bit of time and it should be back for ordering again. Would be my preferred route in terms of ease of use. The DAC uses an external power brick so it is 115V and 230V compatible so doesn't matter where you buy it from. On Amazon it has been hovering around R17,5k plus R3k for taxes and shipping.