I don't know the costs of individual cameras as this one was part of an 8 camera security system. Since its a security system, they're all routed to a DVR and a separate monitor. The people we dealt with were SUPER about talking my husband through the installation and set up. They were recommended by one of our customers and any time we have a question, our rep is happy to talk to us.
It's Mace Security and it was all shipped to us in perfect order. Our guys name is Neil Riverton. I think this is a toll free number 877-585-6223. There may be a location more local to you as I know they have locations in the states and abroad. I think if you just let him know what you are interested in, he could help you and if he thinks that there is a better route for you (radio shack) or something like that he would tell you. In looking on the Internet, I found our cameras which are the Maceview medium range infrared bullet cameras. They don't have audio and they are hard wired. I think they were $109.00 each.
That being said, there was a lady whose goat I watched kidding the other night online who is a BYHer. The video quality wasn't very good, but that may just have been Internet related. She did mention that she had been watching the goat from her recliner so perhaps the picture was better for her in her house. I'll come back and post her name so that you can pm her to inquire about ther set up.