What is the difference between your link and the page you get when you search amazon for witcher 3? I ordered from a third party seller, because it seemed to me that amazon didn't have any copies, but on your link it seems that they're accepting orders. My third party order didn't cost that much more (not like the 399 one which is listed there now), but if I could get it through amazon, and they ship internationally, that would be easier.
I just searched for Witcher 3 collectors edition, came up with that page and it was in stock for PS4 and PC from Amazon themselves so I imagine it's the same? I haven't seen it come up with any third party sellers yet.