Newfrog has this KHET003 Rotating Electric Toothbrush for $9.48 with free shipping.

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Feature:
100% brand new and high quality
Electric toothbrush, twice more effective and efficient than ordinary one
High rotating speed, 7500 times per minute
Round brush bristle, protect your gingiva and tooth enamel
Closed switch, waterproof and comfortable to use
With protective covers to protect the brushes from dust and bacteria
With leakage hole to eliminate the water from the toothbrush
Specification:
Power supply: 2 x AA battery
Material: ABS
Rotating speed: 7500 times/min
Size: 200 x 34 x 26mm
INCLUDED:
1 x Brush Handle
4 x Brush Head
4 x Protective Cover
1 x Brush Holder