Sonifresh via Amazon offers its Sonifresh Kids' Replacement Toothbrush Heads 8-Pack for $18.99. Coupon code "TI3WNVIV" cuts it to $7.98. Plus, Prime members receive free shipping. That's $12 off and the lowest price we could find. They're compatible with a range of Philips Sonicare toothbrushes. Deal ends April 30.