Aupairs in South Africa receive one full day off each week and a range of $50-70 US a week in pocket money.
As an aupair you will need a Work Permit (not a work seekers permit).
Work permits are a form of temporary residence permit. They are issued for a maximum period of one year. Contact the South Africa Department of Home Affairs for specific details.
The Department of Home Affairs
Directorate: Admissions and Aliens Control
Phone: +27 (0)12 810 8624
Fax: +27 (0)12 321 9896
Private Bag X114
Australian Nationals ages 18-25 are eligible for working holiday visas. These 12 month visas allow students or recent graduates who have proof of funds (500 AUD per month) to travel and work in South Africa. Working Holiday Visa's must be applied for through IEP: http://www.iep.org.au/homev3_flash.asp
The SWAP Program is limited to Canadian nationals, ages 18-30, who are full time college students or graduates in the past year, to work in South Africa for up to 12 months. http://www.swap.ca/
There is a BUNAC program for UK nationals, however, it is for volunteers only, you cannot work in South Africa on the BUNAC program.