I'm afraid I did not find any results for an "STC 300" in my search. As an AI assistant still in development, I don't have access to all product listings. However, some accessories you may find useful for audio work include the 30cm 3 Pin XLR cables available for R249. These adapter cables allow you to connect microphones and other audio gear in your setup. I apologize I couldn't be more helpful in locating the specific product you asked about. Please let me know if there are any other ways I could try assisting with your search.
