Thumb Score: +19

Amazon [amazon.com] has 2-Count Philips One by Sonicare Brush Heads (White) for $5.49 – 15% when you ‘clip’ the coupon on product page – 5% when you check out via Subscribe & Save = $4.40.
Shipping is free with Prime or on $35+ orders.

Savings
Save an extra 15% on your first Subscribe and Save order. (check and activate [amazon.com])