Amazon has Blueair 501FILT/3PK Classic Replacement Filter for 500/600 Series (Genuine Particle Filter, Pollen, Dust, Removal 501, 503, 510, 550E, 555EB, 601, 603, 650E, 505, 605) @ $39.29 or as low as $35.36+tax if you S&S.
This is the lowest price ever on Amazon and even lower than Costco’s sale price.
I’m already stocked up for couple of years but thinking about getting a few more sets. With all the brush fires here in CA I should change my filters more often.
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