Ending today, Groupon offers the factory-refurbished Google Chromecast Streaming Media Player, model no. GA3A00028A14, for $20. Coupon code "EPIC3" drops it to $18. With $3.99 for shipping, that's $2 under last week's refurb mention and $13 below the lowest total price we could find for a new one 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.