My guess is that these are limited runs since the publishers probably perceive the audience to be a limited group, and once they're sold out, that's it. Too bad.
I feel fortunate that I ordered (and received) that map when it was first announced for sale in the forum store. I also have received the "Big Map" that's currently in the store. One could suppose, therefore, that moral to this story is not to procrastinate too long if you think you're interested in any of these maps because they may not be available for long.
2010: Porto - SdC - Finisterra 2011: E4 on Crete 2012: Le Puy - SJPdP 2013: Camino Madrid -> Del Salvador -> Primitivo 2014: European Peace Walk. 2015: Amsterdam - SdC & Barcelona -Burgos. 2016:Norte & hospitalero