They're not particularly cheap either. I'm not familiar with ReefTeach and Gypsea's prices but Coral Divers are no cheaper than Triton.
They run a special now at R150 per dive till end of August. Still wasting your money though.
Yes you musy try to get on the Jamboree in September with Scubascene. This is the biggest dive party of the year with lots of competitions and fun diving. Contact the scubascene guys. Ask for shane coomans and tell him Henno refered you. He will organise something.