I will demonstrate using the 74USD example importing with DHL. For a payment with western union you will pay around R 9.12 per USD if the exchange rate is R 8.40(this includes their fees and commission).
1- The purchase price 74USD
2- Shipping via DHL for one item of this size 20USD(on an order of 10 you will halve that amount so USD10 each).
74USD+20USD = 94USD @ R9.18 = R 862.92 upfront payment to the supplier
3- Duties/VAT = 74USD *1.1 = 81.4USD * 14VAT = 11.39USD * R 8.40 R/US = R 95.68 + R 100 DHL South Africa management fee.
In total this device, bought today, will cost approx R 862.92 + R 95.68 + R 100 = R 1058.60.
This means that the bid or buy cost of R 1150 is very reasonable seeing that bid or buy takes R 58 commission for themselves.