WOW! Amazon has the Sonifresh Replacement Head for Philips Sonicare E-Series Tootbrushes 4-pack for just $8.53 after you use promo code KPGQUMXN at checkout. (regularly $16.99) I use these replacement heads myself and like them just as much as the Philips ones. Keep in mind, Amazon pricing and promo codes can change at any time! Don’t wait to purchase this deal or it might be gone when you come back!