You will have to get a quote from the hospital where you plan to give birth, but its normally around R40 000 for a c/s and R 25000 for a natural birth, that does NOT include your gynie's costs, peadiatrician's costs and extras like epidural etc.
Birthing with a private midwife is much cheaper and usually an overall better experience, you will also have more options for birth, like birthing at a birth center, home or birth house facility, using a water birth bath during labour and being able to use a birthing position that suits your body as opposed to the standard hospital "lying on your back" birth position.
Get into contact with a midwife in your area and find out how they work, if you want a natural birth, you won't be sorry.