BetterBasics via Amazon offers the Sterline Sonic Electric Rechargeable Toothbrush for $18.99. Coupon code "SONICT50" cuts that to $17.85. With free shipping for Prime members, that's the lowest price we could find by $9, although we saw it for $3 less last month. It features three replacement heads, three brushing modes, and an automatic timer. Deal ends February 28.