You can get R100 off at Takealot.com by using the following voucher code:
The code can be used on any order (No minimum spend) and expires the 31/05/2015.
Update: Takealot has changed the terms of the voucher. It can now only be used via the Takealot app and on orders over R250.
2nd Update: It seems this code has reached its redeem limit and is now dead.
Thanks to the mybroadband forum for the tip.