Amazon offers the Philips Kid's Sonicare Rechargeable Electric Toothbrush, model no. HX6321/02, for $29.95. Click the $10 off coupon on the product page to drop it to $19.95. Plus, Amazon Prime members bag free shipping. That's the best deal by $10 and the lowest price we've seen. It features 500 strokes per second and syncs with an interactive app.