There are Simply Filters Merv 8 6-packs on Amazon for only a dollar more (for my size) but there are much cheaper options.
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Filtrete and HDX been $3-5 range for many years, never disappointed. Did use the simply filters also, cannot tell the difference to be honest, all the air monitors show the same. Every brand and retailer also got their FPR MPR PPR ratings, it’s a lot like gimmic marketing fluff on most of them.