Wannabe Scion xB owner here. I've been looking for several years but haven't found one I can't live without OR the car was priced out of my range. I may never get the pleasure of owning one of the original square scion xBs, but I'm still looking!
They're all over the place.. You may have to drive 200 or so miles to find one, but the drive back will be awesome. Whether it's a 5 speed (which shifts like butter) or the auto. Anyways, happy hunting..