B&H Photo Video offers two Trendnet Day / Night 802.11n Wireless 2-Way Baby Cameras for $29.99 with free shipping. At $15 each, that beats our June mention (which saw these cameras for $18 each.), is a current best for this quantity by $30, and the lowest per-unit price we've seen. (Most retailers charge about this price or more for just one camera.) It features a microphone and speaker, 4x digital zoom, night vision up to 16 feet, sound and motion detection, remote viewing via its free mobile app, song-playing capability, and mounting hardware.