Amazon offers the Oral-B 3D White Action Replacement Brush Head 2-Pack for $2.10 with free shipping via the directions below. That’s a buck under our January mention and about $3 less than you'd expect to pay in local stores. They feature rubberized bristles with action cup brush heads. To get this deal:
  1. View the Oral-B 3D White Replacement Brush Head 2-Pack for $5.37
  2. clip the $3 off coupon on the product page
  3. order via Subscribe & Save for a final price of $2.10
Of note, Amazon also offers the Oral-B Complete Action Anti-Microbial Replacement Head 2-Pack for $2.67 with free shipping via the steps above. That's the best price we could find by $3. Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.