There are several nodes running Bitcoin that appear in South Africa:
  http://maps.google.com/maps?q=https://smsz.net/btcStats/bitcoin.kml

There was a site, bitcoin.co.za but the site no longer responds.  The google cache shows an email and phone number yet:
http://webcache.googleusercontent.com/search?q=cache:C2nEqD_XfrQJ:www.bitcoin.co.za/%3Fm%3D201102+bitcoin+zar

You might wish to add a marker with some contact info, perhaps there are others nearby who just don't know about each other.
   http://www.BitcoinMap.com

There are no exchangers listed yet on Bitcoin.local for South Africa:
  http://tradebitcoin.com

There are no sell orders listed for ZAR, but you can list ZAR buy orders on the Bitcoin Over the Counter (OTC) marketplace -- maybe someone will see it and offer to trade:
  http://bitcoin-otc.com
  http://bitcoin-otc.com/vieworderbook.php