Amazon Prime: Aprilaire 413 Healthy Home Air Filter (Pack of 8) $207.42

Stacks with the Amex 20% off.
Works out to $207.42 before tax with prime day 20% off, which is about ~$26 per filter.
With amex 20% off, it’s $167.02 + tax, which is ~$21 per filter.
https://smile.amazon.com/gp/produ…UTF8&psc=1