Stock up on clean air for less. Right now, FilterKing.com is offering 15% off any 6-pack or larger of air filters, plus free shipping, when you use our exclusive code BRAD15 at checkout. It's the perfect time to grab a bulk supply so you're covered for months (or even a year) without having to think about it again. For example, the pictured 20x20x1 6-Pack drops from $35.94 to $30.55 with the code, and shipping is free. That breaks down to just $5.06 per filter! Through this link you can select the exact size of the air filters you need.