Sleuth Kings Black Friday Coupon: Save $10 on your first month! Last updated by Hello Subscription on November 23, 2018. Black Friday 2018 Subscription Box Deals / Black Friday Subscription Box Deals & Coupons / Holiday Subscription Box Deals & Doorbusters / Subscription Box Coupons & Deals / Sleuth Kings Coupons / Geek & Gamer Black Friday 2019 Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification Sleuth Kings Black Friday 2018 Deal Save $10 on your first month! Use coupon code HELLOBF. Expires 11/27 Visit Sleuth Kings to get this deal! Check out all of the Black Friday Subscription Box Deals!