$53.99 Aprilaire 213 Air Filter $39.47 (REG $57.85) - Mojosavings.com
Aprilaire 213 Air Filter for Aprilaire Whole Home Air Purifiers, MERV 13 (Pack of 4) - Walmart.com
Aprilaire 213 (8-Pack) - 20 x 26 x 4 Expandable Air Filter, MERV 13 - Walmart.com - Walmart.com
