Groupon offers the factory-refurbished Google Chromecast Streaming Media Player for $25 with free shipping. That's $4 under our mention of a new unit from last week and $10 under the lowest total price we could find for a new one today. (For further comparison, we saw a refurb for the same price two weeks ago.) 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. It also allows you to use your Apple or Android device as a remote. A 1-year Google warranty applies.