Target is offering the Philips Sonicare 2 Series Plaque Control Rechargeable Electric Toothbrush (HX6211) for $19.99. Simply use code SAVE10 at checkout. Shipping is free in orders over $35, otherwise opt for in-store pick up. Alternatively, become a REDcard holder and get 5% off with free delivery (get $30 off select $100 purchases with sign-up right now). Available in all colors outside of white, this is within $5 of the all-time low and the best we can find. It goes for $30 at Amazon right now where it carries a 4+ star rating from over 7,200 customers. More details below.
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There are some lesser-known brands out there with similar products for less like this option for $18 Prime shipped. Other than that, the battery-operated options are going to be your next best bet at a lower price.
Philips Sonicare 2 Electric Toothbrush:
Remove more tooth-decaying plaque and avoid cavities with the Philips Sonicare 2 Series plaque control rechargeable electric toothbrush HX6211. The snap-on ProResults plaque control brush head features curved bristles to match the shape of your teeth for a superior clean that removes up to 6x more plaque than a manual toothbrush.