altatac via eBay offers the Swann 1/4" CMOS HawkEye Wireless Camera, model no. SWADW-DHAWKE-RS, for $44.99 with free shipping. (Amazon has it for a buck more, but stock may be limited.) That's the lowest total price we could find by $3. It has a transmission range of up to 165 feet, and includes a digital receiver, SD card slot that can support up to 32GB storage, 27 infrared LEDs, and CMOS 1/4" sensor.