First, you will need to find out what tenders are currently open, or being advertised. Most of this information is available online:

For information on national government tenders download the weekly Tender Bulletin. This contains details of all tenders including closing dates, who to contact with queries and where to submit applications.

Western Cape Provincial Government Tenders are available on the tenders section of this site, which is updated every week. You can search through the entries either by category (e.g.  medical or computer equipment) or by any key word you choose.  

• More information about the tender process and how it works
• Tender policies
• How to submit a tender.

The City of Cape Town publishes all its open tenders on the City of Cape Town website.

• Registration information on the City of Cape Town website 
• Download the supplier registration form