I need to replace my "Harmony One" node filter circuit but I see they are out of stock on the web page (https://www.alanmaherdesigns.net/shop-c1kcd). Does anyone have an old one they would sell?

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now