Amazon offers the Philips Kids' Sonicare Rechargeable Toothbrush, model no. HX6311/07, for $44.99. Clip the $10 off coupon to cut the price to $34.99. (Drugstore.com offers it for the same price via a clippable coupon on the product page.) With free shipping, that's the lowest total price we could find by $5. Features include a KidTimer function for two minutes of brushing, variable power settings, and interchangeable stickers.