Kershaw is having a ton of trouble getting all of the models made. they are discontinuing a ton of models in 2012, and so they should have an easier time after that, but they are having some trouble for the time being if i understand correctly.
disclaimer: I do not work for kershaw, and my only affiliation with them is the fact that I own some of their knives. all information on the subject has been gleaned from posts by Thomas W on the forum, and is subject to change.