https://amzn.to/3KOb9V3 2-Pack Philips Sonicare C3 2-in-1 Plaque Removal + Whitening Brush Heads (Black or White) for $19.99 - $5 when you 'clip' the coupon on product page - $1 (5%) when you check out via Subscribe & Save = $13.99. Shipping is free with Prime or on $35+ orders.