Merchandise

Collected editions
The series has so far been collected into the following collections:

Trade Paperback (6-issue collections)
The trade paperbacks collect six issues each, but contain only the story and no cover art. Each paperback follows the custom of having a three-word title.

Hardcovers (12-issue collections)
All hardcovers contain the material from the comics including the covers, and in some cases, bonus material. The trim size of the books are larger than the paperbacks. Each hardcover contains two story arcs from the series. There are signed versions of the books available, each of which are limited to 300 pieces.

Omnibus Editions (24-issue collections)
Limited Edition Omnibus editions collect 24 issues in a slipcase with several extras. As limited edition versions, the first volume is autographed by Robert Kirkman and Charlie Adlard with 300 pieces available. The second volume has a standard release of 3000 pieces, and there is also a deluxe limited edition (signed by Kirkman/Adlard) with 300 pieces available.

The Limited Edition retailer giveaway is limited Hardcover of the softcover Vol. 1, with black faux leather cover and red foil highlights.

Compendium Editions (48-issue collections)
These are 48 issue paperback editions.