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Forgive me, this is my first deal post in a couple of years. I searched the site and didn’t find this deal yet.

Amazon.com [amazon.com] has select 3M Filtrete filters on sale for an extra 20% off from April 1, 2015 through May 14, 2015. 20% off applied at checkout.

Click filter of choice to see more sizes on detail page.

Filtrete Ultra 1500 [amazon.com]
Filtrete Ultimate 1900 [amazon.com]
Filtrete Elite 2200 [amazon.com]

Comparable price/unit on Lowes.com is $ 16.97/unit. Just picked up Ultra 1500 20x20x1 for $ 9.45/unit after discount.

Free Prime shipping.