Introducing Alexa cheap echo.
just using RaspberryPI 3, microphone, speaker.
links that in this slide below.
https://developer.amazon.com/public/solutions/alexa/alexa-voice-service
https://github.com/jaws-ug-kobe/AlexaPi
https://www.youtube.com/watch?v=frH9HaQTFL8
https://github.com/amimoto-ami/amimoto-amazon-alexa