Interesting thread.
I've been drooling on the other sister forum when they talked "group buy" and there are quite few threads about that. The newest one is for "august group buy" and they bought double start M12 and M14. Interesting, as mos of the previous purchases where triple start.
Maybe if you could talk to the "Group Buy Coordinator". They could guide you in asking Tapco the right questions, traps and tricks, and maybe they already have order codes from Tapco.
I would be interested if the price is right. I was looking for these for a long time and US prices where just ... too much.