Groupon offers the factory-refurbished Google Chromecast Streaming Media Player for $19 plus $3.99 for shipping. That's $11 under the lowest total price we could find for a new one, although we saw a refurb for a buck less last month. It attaches to your HDTV's HDMI port and connects to your wireless network to receive streaming online video, music, websites, and more from your smartphone, tablet, or laptop. A 90-day Google warranty applies. Deal ends today.