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Drugstore.com has this Oral B Professional Care SmartSeries 4000 Rechargeable Power Toothbrush for $99.99 with free shipping. A coupon on the page saves you $10. at checkout use code WELCOME20 to drop the price to $71.99. This 50% Mail-in Rebate cuts the price to $35.99. This is the best price we could find. From 30 reviews it has a 4.5-star rating. There's no sales tax (except in NJ, NY, and WA).