Gainz Box May 2019 Theme Spoilers + Coupon! Posted by Hello Subscription on April 21, 2019. Subscription Box Spoilers / Gainz Box Spoilers Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification We have the theme spoilers for Gain[z] Box May 2019 subscription box! It’s the R + R Box! DEAL: Get $5 off your first box just use the code GZBX5 OR RESTUP. Valid to new subscribers only. Are you getting Gain[z] box this month?