How much are Colgate E1 Toothbrush refills?

Where can I buy Colgate Connect E1 Smart Electric Toothbrush brush replacements?

E1 Refill Pack

Replacement heads for the Colgate Connect E1 Smart Electric Toothbrush are $19 through colgate.com. It is recommended that you change your brush head every 3-months. The E1 refill pack comes with 3 "easy-on, easy-off" brush heads.