Thumb Score: +72

Amazon [amazon.com] has 3-Count Philips Sonicare Genuine C2 Optimal Plaque Control Toothbrush Heads for $11.99 – $5 when you ‘clip’ the coupon on product page – 5% when you check out via Subscribe & Save = $6.39.
Shipping is free with Prime or on $35+ orders.

Savings
Save an extra $5 on your first Subscribe and Save order. (check and activate [amazon.com])