Free Kerblams, sometimes referred as Special Kerblam Deliveries, were a type of Kerblam Box provided by Kerb!am that were often free of charge. (GAME: Lost in Time)

The Thirteenth Doctor once received a Box containing a fez despite claiming not to remember ordering it. (TV: Kerblam!) The Eleventh Doctor once noted upon having lost his fez that he could buy one. (TV: The Big Bang)