Although Velvet Sky Airline (velveysky.co.za) is still a brand new airline, or perhaps because of it, they have launched a special. We are not too sure exactly what they special will be, as they have not yet provided details. However their first flight is on the 22 March, and we imagine that the Velvet Sky special will be someone during that week. The first flight will be from Durban to Cape Town, and so the special will most likely also be on that route. As we hear more, we’ll update this page.
UPDATE:
We have heard from Velvet Sky and the specials they are launching with are:

*one way, including all taxes

Durban <-> Joburg R200
Durban <-> Cape Town R400

These prices are for travel between 22 March – 12 April, subject to availability.

You need to book these specials directly at their website

*their standard terms and conditions apply. E&OE