Slutbox Coupon: Get a Mystery Past Box As Your First Box & Just Pay $19.95! Last updated by Hello Subscription on March 23, 2019. Subscription Box Coupons & Deals / Slutbox Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification Slutbox has a new sale! Start your subscription with a Mystery Past Box, and just pay $19.95 (instead of $29.99)! No coupon needed, just use this link to subscribe! Get a Mystery Past Box for just $19.95! Here’s what you can get: Are you getting Slutbox?