Hello Theresa,
Definitely, Mauritius is cheaper than SA and our money is Rs 4 to make a Rand, which means that your money has 4 times its value.
Food is relatively cheap, except meat which is of inferior quality than SA (steaks etc...)
The cost for accommodation is not expensive and you can expect to rent for Rs 15,000 for a 2 bedroom apartment since its almost rare to get a 1 bedroom apartment.
Hope this will help you.
Do not hesitate to contact me should you additional info.
With thanks,
Kurt (+2307566418)