Well, for the sake of completion: FastTech replied to my request on April the 24th. Their answer was “the supplier could not provide this item now”.
Checked out the WindyFire website a while ago. Seems they've decided to handle their stuff's commercialization personally, as they've opened a “free” shipping section mostly geared for Europe and Russia.
Well, this is as good as it gets for now. Pretty outdated li-ion tech on 14500 cells, sorry.