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Gabe here from Shopify, and a great question there!
So from what I gather, you are dropshipping to South Africa using AliExpress and any products being shipped to South Africa from the suppliers are getting an expensive shipping rate in AliExpress/Oberlo, is that correct?
You should be able to choose from different shipping rates on Ali such as epacket or free shipping or China Mail. See an example here:
If these options are not available for a particular product then this is often as a result of that particular supplier and you may have to shop around until you find a reasonable shipping rate with a different supplier.
See more on the above Shipping rates here.
Hope that helps a bit!
All the best, Gabe