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Amazon [amazon.com] has Official/Genuine Winix 116130 Replacement Filter H (True HEPA air purifier filter for Winix 5500-2) on sale for $ 34.99.
Shipped and Sold directly by Amazon. Shipping is free with Prime, or $ 35+ order for non-Prime members.
Set includes activated charcoal filter (washable), and true HEPA filter. (One year supply)

This is the lowest price I’ve ever seen for this genuine, non 3rd-party replacement. Camelx3 price comparison agrees.