Federation Models I believe has these back in stock. I want to get one myself but I am still a bit broke right now (and an impulse purchase of a Timeslip Ranger 3 last month didn't help matters).
The RU kit is a very nice offering. While maybe it is a little off from a 22" Studio Model, it can always be modified and IMHO, ultimately is better in several areas to make it a model that is superior to the 22" model based kits that I have seen.
Happy to help. Although mine is in a box in the closet it looks like a great cast. My understanding is that the earlier kits had some flaws that were corrected on later runs (and the price dropped a hundred bucks as well).