Amazon offers the Philips Sonicare Adaptive Clean Brush Head 2-Pack in White or Black for $9.20 with free shipping via the steps below. That's tied with our mention from last week as the lowest price we've seen. (It's the best deal now by $11.) They remove about 10 times the plaque of manual brushes. To get this deal:
Amazon offers the Oral-B 1000 CrossAction Rechargeable Toothbrush in Black for $39.97. Clip the $10 off on-page coupon, and the price drops to $29.97. With free shipping, that's the lowest price we could find by $10, although we saw it for $15 less with rebate hassles last December. It features an in-handle timer and pressure sensor.