Just thought I would make mention of these guys, its by no means promoting, I just happened to find this business in my area when looking for EWC
We all know how pricey worm castings are, found some guys in my area called Davley Organics (google them) who sell 20L bags for R55, 40L for R110 and so on. I don't know what their delivery options are but enquire with them and see what they can do. They're just outside Nelspruit