InstaCart automatically tacks on a 10% “Service Fee” to every order you place, but you can actually opt-out of this fee to save 10% on every InstaCart order you place.
Update: Since we wrote this article in January 2018, Instacart has changed its policies. Instacart now charges a service fee for 5%, with a minimum of $2. You can no longer choose to waive the service fee.