Need Car Parts or a New Car Stereo? 12% Off at JCWhitney Today Only! By Becky | April 22, 2012 0 Comment JC Whitney has a coupon code that’s good for Earth Day (today) only: JCWEARTHDAY takes 12% off orders of $115 or more! PLUS they have some terrific sale pricing for today only. You’ll get 5% cashback from QR, too!