Costco started a sale on the 3M HVAC smart filters today for both the one and four inch size. A 4 pack of one inch filters is $65 online and should be less in the stores.
There is also a rebate of up to $12 available from 3M if you buy before the end of the year
https://www.filtrete.co
A 2 pack of the one inch filters sells for $58 at Amazon.
https://www.costco.com/3m-filtret…98071
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