Hi, Mike from 2000 AD here!
Sorry to hear people have been having difficulty getting hold of our comics - 2000 AD ships from the UK on time and we're not sure why some US shops have had problems securing copies. We've been having extensive talks with Diamond to try and get to the bottom of it, but it seems like stores are still finding it hard.
However, ALL of our books and comics are advertised in Previews so stores can order them through Diamond, same as everyone else's books - we also have a North American line of collections that are specifically printed by Simon and Schuster, and distributed in the US and Canada through Diamond and Barnes & Noble.
If you or your LCBS are having problems, please drop us a line at email@example.com and we'll see what we can do!