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Vizio s4251 w-b4 subwoofer - $20
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https://cdn.vizio.com/misc/QuickStartGuides/kb/s4251wb4qsg.pdf
It's part of this very well reviewed set:
https://hometheaterreview.com/vizio-s4251w-b4-soundbar-and-wireless-sub-reviewed/
I have not tested it recently and don't have the soundbar, but it appears in excellent shape and at $20 is priced to be a steal for someone who has a compatible soundbar and has knowhow to pair it.