Groupon offers the factory-refurbished Google Chromecast Streaming Media Player, model no. GA3A00028A14, for $20 plus $3.99 for shipping. That's a buck under our April mention of a new model (although that deal required in-store pickup) and $5 below the lowest total price we could find for a new one now. 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.