Has anyone found a Miracast HDMI dongle that works well and is not too expensive?

For those to whom (like me until I got my new phone yesterday) the words "Miracast dongle" convey nothing, it's a WiFi gizmo that you plug into an HDMI input on your TV. If your phone, tablet, or whatever other device supports it, you can then display your device's screen on the TV. You can read about it here.