Save 15% on Birchbox Gift Subscriptions! Posted by Hello Subscription on August 23, 2017. Subscription Box Coupons & Deals / Birchbox Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification For a limited time Birchbox is offering up to 15% off 6- and 12-month Birchbox gift subscriptions! Just use code BACKTOSCHOOL!