BetterBasics via Amazon offers the Sterline Sonic Electric Rechargeable Toothbrush for $29.99. Coupon code "BRISTLE1" cuts that to $22.79. With free shipping, 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, 31,000 brush strokes per minute, and an automatic timer. Deal ends December 30.

Update: The price has dropped to $19.50 before coupon, $14.82 after.