Groupon offers the factory-refurbished Google Chromecast Streaming Media Player for $20 plus $3.99 for shipping. That's tied with our mention of a refurb from last week and $6 under the lowest total price we could find for a new unit today. 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.