So, putting it as FYI here, some of the alternatives to Fasttech (please feel free to add more and I will update the list) which ship to SA:
sourcemore.com (confirmed with them recently that they ship to SA)
3avape.com
3fvape.com
healthcabin.net
sourcemore.com (confirmed with them recently that they ship to SA)
3avape.com
3fvape.com
healthcabin.net