Amazon offers the Oral-B 3D White Action Replacement Toothbrush Head 2-Pack for $2.67 with free shipping via the directions below. That's tied with our August mention and the lowest total price we could find by $6. They feature rubberized bristles with action cup brush heads. To get this price:
  1. View the Oral-B 3D White Action Replacement Toothbrush Head 2-Pack for $5.97
  2. clip the $3 off coupon to cut it to $2.97
  3. add it to your cart via Subscribe & Save to drop it to $2.67 and bag free shipping
Be sure to cancel Subscribe & Save after your order arrives, or you'll be billed for subsequent shipments.