Jintop via Amazon offers the Guhiwuk Philips Sonicare Toothbrush Replacement Head 4-Pack for $12.99. Coupon code "4ZRFPLSU" cuts the price to $9.09. With free shipping for Prime members, that's $4 off and the lowest price we could find. They each come with a protective cover and feature diamond shaped bristles. Deal ends July 16.