Jintop via Amazon offers the Guhiwuk Philips Sonicare Toothbrush Replacement Head 4-Pack for $13.99. Coupon code "I6K8DCOX" cuts the price to $8.39. With free shipping for Prime members, that's about a buck under our mention from two weeks ago, $6 off list, and the lowest price we could find. They each come with a protective cover and feature diamond shaped bristles. Deal ends June 18.