Roku runs in much the same way as Apple TV. The device plugs into a power source and a TV. It pulls in streaming video through a Wi-Fi or Ethernet connection. While Roku does not stream YouTube, it is compatible with a variety of operating systems unlike Apple TV. And, as an added bonus, you can listen to your video through a headphone jack in the remote, if so desired.
How it works: Roku streams videos over the Internet via Wi-Fi or Ethernet.
Mirroring: Yes, via the free Roku app for iOS and Android.
Price: $99, plus the cost of an HDMI cable
Where can you buy one: Roku.com, Amazon.com, BestBuy.com, WalMart, Target, and many other retailers.
Compatibility: iOS, Mac OSX, Android, and Windows
Remote: Yes; the remote also has a headphone jack, and can function as a gaming device.