Walmart offers the Oral-B Pro 5000 SmartSeries Bluetooth Rechargeable Electric Toothbrush for $84.94. Redeem this $20 mail-in rebate to knock it to $64.94. With free shipping, that's the lowest price we could find by $20, although it was $10 less in February with no rebate required. It features five cleaning modes, a pressure sensor, and real-time feedback via the Oral-B app for iOS or Android. Rebate ends June 30.