(I wasn't sure what board to put this under? Teeth or gear or health...)

Do you use a battery powered toothbrush for your child? Can you recommend one? He's asked for a "buzzing" toothbrush like mommy and daddy for his 3rd birthday, and we're wondering which one to get. I'd like to keep it under $40 if possible- save the $$$$ Sonicare ones for when he's older! (And no characters either- plain would be great)