Altatac via Rakuten offers the refurbished D-Link Day & Night WiFi Security Camera in White for $19.99. Coupon code "ATL2D" drops it to $19.99. With free shipping, that's the lowest price we could find for a refurb by $8, although it was briefly $2 less four day ago. It features sound and motion detection, night vision up to 16 feet, and video resolutions up to 640x480 at 30 fps. It pairs with the mydlink app.

Note: No warranty information is provided.