First off, two variant covers of issue 100:
Next, a great limited edition watch (only 500 were made) signed by Robert Kirkman:
Third up is a Skybound variant action figure featuring Michonne "bloodied":
Finally, there's a really fantastic hardcover Walking Dead Compendium that's been limited to only 1000 copies!
If any of you Deadites have photos you'd like to share from the SDCC please send them my way!