Amazon continues to cut an extra $2 off select ATP Carbon Activated Premium Cabin Air Filters via this clippable coupon. Plus, take an extra 15% off and bag free shipping when you order via Subscribe & Save. A couple best bets after both discounts:

• ATP RA-6 Premium Cabin Air Filter for $9.52 (pictured, low by $9)
• ATP RA-31 Premium Cabin Air Filter for $12.54 (low by $4)