I recently bought two M3's - in both instances, they were purchases of opportunity that I did not know I would be making when I woke up that morning. On the first, I was alerted by another member that his local shop had one in stock so I called and had it paid for within an hour. For the second, I posted a long shot WTB ad looking for another M3 and, again, another member PM'ed me telling me that Baker Airguns had just received a couple. An hour later, I had my 2nd M3 paid for. Shockingly, neither of these rifles were pre-paid for by someone on any sort of waiting list.
I guess what I'm saying is, if you're not set on buying from any particular dealer, poke around and they do surface from time to time.