Amazon has the 12 Pack Replacement Toothbrush Heads (Compatible w/ Philips Sonicare) for a low $13.29 after Coupon Code: "22OMRNDV" (Exp Soon). Free Shipping on orders over $25, or with Amazon Prime. This normally retails for $18.99, so you are saving 30% off list price.
Delamu replacement brush heads compatible with Philips Sonicare electric toothbrush snap-on handles. They are easily snap in and out of HealthyWhite, FlexCare, Gum Health, DiamondClean and Easy Clean toothbrushes.