That's probably a great price. I assume these are 1"? My go to guys are iaqsource.com[iaqsource.com]. I got a new furnance a few months ago and switched to a 4" filter. Instead of paying $60 each from the HVAC man or 1/2 that retail, I picked up a (6) pack of 16x25x4 highly rated unbranded Merv 11's for $80 shipped ($13.33/each). I don't smoke or have animals or allergies so I chose the 11's over the 13's which they also offer for a little more money. I'm also changing them every 6 months even though I could most likely go a year with the 4" filters.
I just checked iaq and they sell the 3M you are describing for $99 and are calling it a Merv 11 but it might be closer to a 13 if you believe what you read on Amazon. They also have an unbranded 6-pack of Merv 11's for $32.59 so for those of you without a Costco, maybe consider giving iaq a shot. They have lots of great reviews on their unbranded filters. I've got a big stack of them behind my heater and the HVAC guy who just did our spring check up was thoroughly impressed with the receipt I showed him from iaq.
OP deal is available in north Austin, as well. Pretty sure I saw 20x20 on display, but didn't really check since I've stocked up with all the Target/Lowe's coupon/rebate deals lately. IF you like this higher rated filter, the Costco deal brings the cost down 'almost' to the typical Red 1000 price. Don't forget to check the Filtrete site for current or near future rebates from 3M.
In addition to three OTHER sizes , I have an odd 20 x 24 for which I've fashioned an electrostatic washable filter...since I haven't found a regular source for the strange size.
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