AltaTac via Walmart offers the D-Link 802.11n Wireless Day/Night Surveillance Camera in Black, model no. DCS-934L, for $39.99 with free shipping. (Jet.com has it for the same price with free shipping.) That's the lowest total price we could find by $2, although we saw it for a buck less in May. It features integrated motion-sensing technology, up to 16 feet of night vision, and a mounting kit.