Walmart offers the Night Owl 720p HD Security Camera 2-Pack for $79.35. Choose in-store pickup to cut that to $78.95. (Amazon charges the same with free shipping.) That's the lowest price we could find by $8. Each indoor/outdoor bullet camera features a 1280x720 (720p) resolution, 70° wide-angle lens, and infrared night vision up to 100 feet. They come with two 60-foot video cables.

Note: A Night Owl AHD series DVR is required for use (sold separately).

Update: The price has dropped to $79.35 before in-cart discount, $71.06 after. Amazon now charges the same.