Best Buy has the Echo Subwoofer for $109.99 plus you can add a smart plug for $5.
Out of stock currently but I ordered and ETA is Jan 6th.
I upgraded all my echos to gen 3 recently, and have 2 in my office for stereo sound. Adding the sub for a 2.1 setup and needed a smart plug to power up my Arcade cabinet without having to mod it with a switch
https://www.bestbuy.com/site/amaz…Id=62879
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