isingo msa3 replacement filter, compatible with membrane solutions msa3/msa3s air purifier,?upgraded?3-in-1 filter, 2-pack - standard version is up for auction in Appliances. The current bid is $1.00, 96% below the $28.39 MSRP, in New/Like New condition. Bid on this item at our Rogers - N Dixieland Rd. location before the auction closes.