And even without the schedules, the sellers will tell you when they arrive.
I wanted one, so i kept an eye on pihut, and they announced on their twitter when they'd have new stock, so i made sure i was ready to buy one then, and got one of the second batch they sold. And i'm by no means someone who uses twitter (literally the first time i've ever had use for it, found the post by googling). But if you really want one, how hard is it really to just keep up to date a bit with the shop you know sells it... they know it's important for their customers, so they'll warn them via the channels they have of when they will be available
If you don't have one right now, you just don't want it that hard, if you would have, you'd have taken the bit of time it takes to be up to date with when new batches arrive, and order one when it became available.