Walmart offers the Zmodo 720p Mini WiFi Camera, model no. ZM-SH75D001-WA, for $35.80. (Home Depot,, and Amazon charge the same.) Opt for in-store pickup to dodge the $5.97 shipping fee. That's the lowest price we could find by $2, although we saw it for $3 less in May. It features 16-foot night vision, 720p resolution, 2-way microphone, and motion-detection alerts via smartphone app.