Thank you for the replies. Machinetoolwarehouse has them, but the prices are high and they're on the other side of the country from me. If I was going to get a machine from them I'd probably spend the extra on a Super X3 and probably a bigger lathe, too. I note on Novakon's site that a college which is close enough to me uses their machines, so they might have a line on getting such things without getting the bone at the border.
The great thing about having some time to save up some money for this is that is gives me the time to plan it, too. Maybe I'll get lucky and find one on Kijiji.