NAPR_GROUP

Hi my name is Adam and I was looking for some information. I have a Samsung SMO-151QN Security System (CCTV) I have 4 cams with it but there is spots for 4 more cams. My question I was needing to know is, where can I get more cams. They have a Ethernet connections cables to hook up the cams to the CCTV. Now is there away to coveted AV cables to a Ethernet cable or does anyone know where I can get cameras that have Ethernet hook up. Thank you. Adam W.