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Geeks.com has the Four Wireless Infrared Day/Night Color Cameras and Receiver for $128 + shipping. Shipping starts at $9. "Not only do they transmit a great color picture in normal light conditions, but at low or no light conditions, they automatically become infrared cameras."

Description:
Features/Specifications:
* Wireless Infrared Color Cameras and Receiver
*
* General Features:
* Wireless Camera Features:
* Four (4) night vision infrared camera
* Color camera in normal light
* Great for low light applications
* 30 IR LED bulbs
* Works great as a baby monitor or for home/business surveillance
* Operates on the 2.4 GHz frequency
* 1/3-inch image sensor
* NTSC format (standard format for USA and many other countries)
* 90 MHz - 200 MHz output frequency
* 200 mw output power
* 50 M / 100 M distance (150 to 300 feet) - depends of line of site, walls, etc.
* Low power consumption
* Silver camera body color
* Can be used with or without the wireless receiver (camera can be wired directly to TV/VCR/Capture Card (standard RCA video output)
* Powered by the included AC/DC 12v power adapters