Clip the 15% off Coupon located under the price or product description and checkout. If you are on mobile scroll all the way to the bottom of the page and click on Amazon Full Site so that you can see the coupon.
Choose Subscribe and save on the right side of the page and click review subscription.
Subscribe and save can be cancelled anytime after the order ships, no further charges, just click here to cancel. If you do not cancel you will be shipped another order at the interval you indicated when you signed up.