You'll see one or two a year in the classifieds here. If you can get a later model, put a 28-30' box on it, you're lookin good. But they don't make as many, and the difficulty of finding anything newer than an '01 is starting to make the idea obsolete. At $95k for a new cabover, they aren't as affordable as they used to be. I'd still look into one if I could afford a new truck, as you have so many more options than with a conventional expediter.
-Vampire Super Slooth Trucker!!!