The Echo and Sub are no longer available as a 3-piece bundle, though you can still purchase the components separately. The Echo Sub
Echo Sub Bundle Review
Echo Sub review: Add some serious bass to your Echo or Echo Plus speakers
Echo Sub Review: An Affordable Subwoofer for Compatible Echo Devices
Echo Sub review: Exactly what you need for Alexa-powered music
The Ultimate Speaker Home Cinema Set Up Two Echo Studio's Plus Echo Subwoofer!
Netgear Orbi Voice review: It's not the best smart speaker, but it's an excellent mesh Wi-Fi system
Echo Studio review: Better than ever, but is that enough?
Echo Sub: Good Hardware Meets Limited Software
Echo Sub review: All about that bass and we're delighted Review
Echo Studio review: Better than ever, but is that enough?