Thanks for the links
I've been keeping my eyes out on eBay, but haven't seen any listings for this particular model. Might be pretty rare, but there's an extensive Wikipedia page, so there's gotta be more that just aren't being sold.
It seems like something I would actually use day-to-day, assuming that it has a good keyboard. The mouse-joystick would help a lot compared to the styluses that most compact devices.
Wiki says that it is "9.7 by 5.9 by 1.6 inches
(246 by 150 by 41 mm
)", which isn't as compact compared to a lot of the devices here. It's still smaller than the majority of laptops.