Birchbox + Birchbox Man: 25% Off ALL Exclusive Kits! Posted by Hello Subscription on March 19, 2018. Subscription Box Coupons & Deals / Birchbox Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification New Birchbox Offer: use coupon code KIT25 to save 24% off Birchbox exclusive kits & Birchbox Man exclusive kits. Ends 3/1. Don’t forget to Add a Mystery Sample Pack before you check out!