Thanks blue crane, that's nice to know.
Kalahari.net is definitely the cheapest, then. The only problem with them is their packaging. My copy of The Darklands had a nasty scratch on the cover because of the poor packaging

, but the other two books were in a decent condition.
Btw, this is what I paid for the books:
R156.76 for Magic of Magnamund
R156.76 for The Darklands
R264.76 for LWRPG
which comes to a total of R578.28.
I'll definitly give The Outer Limits a try. I've heard of them before. I think they have a branch here in the mother city as well.