[Skunkworks] RCA-BNC adapter wanted

Hi Guys, Am looking for the following items; RCA connectors with cable of at least 50 meters BNC connectors with cable at least 50 meters an RCA BNC adapter. Where can I get these items and what are the estimated costs. These are needed urgently -- Simon Gatonye 0722993642 P.O. Box 75232 Nairobi - 0200