AltaTac via eBay offers the refurbished D-Link Day & Night WiFi Security Camera in White for $19.95 with free shipping. That's tied with our mention from two weeks ago and the lowest price we could find for a refurb by $8. 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: A 90-day warranty applies, but it's unclear who backs it.