I have an implant (implanon) that just expired. where can i get another one inserted considering that previously i had it inserted at my local clinic and they don't have any stock?

Call around: Most Healthtap docs who answer these questions are in the US. A lot of us don't know much about resources in ZA. Ask your clinic if they know who has Implanon or start calling other doctors or your local hospital to ask for help locating one. In the meantime use condoms! During the COVID-19 pandemic, it is a very bad idea to get pregnant as healthcare systems are having too many problems now.