The BAM! Horror Box Coupon: Save $3 On First Box! Last updated by Hello Subscription on December 6, 2017. Subscription Box Coupons & Deals / Bam! Horror Box Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification For a limited time Bam! Horror Box is offering a first time box deal: Use code HALLOWEEN to take $3 off your first box! We have franchise spoilers for the October 2017 The BAM! Horror Box!