I understand your desire for a smaller version from the standpoint of $$$. But other than that, I see no advantage to the 18" and smaller grills. Even if you are cooking for one, the limited grill space makes it difficult to cook a full meal including veggies, etc. Setting up different zones for direct and indirect cooking is also virtually impossible on a small grill. If transportation is a problem, read the posts on how to take the KK apart to move it in pieces.
If anything, I would like to see a larger KK, but 22 inches is enough and I couldn't afford anything larger anyway.
Doug