Philips Sonicare Rechargeable Electric Toothbrush for Kids – Link 
Amazon has this right now for $39.95 w/free shipping.
Even sweeter, Clip the $10 coupon, which can be found right below the price, dropping the total to $29.95!
Other merchants on Amazon are selling this for between $50-$57.
- KidTimer extends brushing time each day until dentist recommended 2 minutes is reached
- KidPacer alerts the child to move to the next quadrant of the mouth to ensure a thorough cleaning
- 75% more effective than manual toothbrushes in hard to reach places
- 8 cool design stickers + 2 bonus sticker sheets for a fun and customized brush
- Rubberized and extra soft brush head is designed to protect young teeth