S-Video

http://www.svideo.com/svideo2bnc.html

http://store.yahoo.com/videoware/sv2bnc1.html (looks like same page as above)

http://www.pccables.com/70711.htm (this one is cheaper but is RCA with
BNC adapters)

http://www.mycableshop.com/sku/CSV2BNC-10.htm (10' length, cheaper ???)

I bought from Svideo.com.