http://www.supercircuits.com/Connectors/ - Finding supplies of BNC connectors can be easily done on the internet. Listings for companies that supply BNC and RCA connectors are everywhere online, and it's just a matter of choosing the right audio video connectors for the type of electronics you have. Make sure the RCA and BNC connectors you choose are compatible with the device you want to use them on to prevent equipment malfunction.