Subscription box
From Tardis Wiki, the free Doctor Who reference
A subscription box is a service that delivers a monthly box of merchandise relating to movies, TV shows, and video games. Some Doctor Who merchandise is exclusive to subscription boxes, namely issues of Titan Comics with exclusive covers.
Cover gallery
The Third Doctor #1 Loot Crate Cover by Claudia Ianniciello
The Twelfth Doctor #12 Loot Crate Cover
The Road to the Thirteenth Doctor Loot Crate Cover
The Thirteenth Doctor #1 ZBOX Cover by Pasquale Qualano