Newegg offers the TRENDnet 802.11n Wireless Security Camera, model no. TV-IP551W, for $19.99 with free shipping. That's $13 under our mention of a single camera from three weeks ago and tied with our June mention of two cameras as the best per-camera price we've seen. (It's a current low for a single camera by $28.) Features include a 640x480 video resolution, 4x digital zoom, and built-in omni-directional microphone.