A look at what is currently available on eBay

8CH 8 CHANNELS Home Video Surveillance CCTV DVR Security System + 4 color Camera
US $265.99

Digital Wireless Video Camera USB Receiver DVR Home Security CCTV System Kit
US $179.99

4CH 4 CHANNELS Home Video Surveillance CCTV DVR Security System + 4 color Camera
US $145.99

Standalone [...]