>>6210323correction:
I chose EMS-shipping, which cost 10 bucks and some change for me. Their free surface shipping option takes 4 to 16 weeks
For all interested parties:
A Dakimakura-cover and some other goodies were released as well with the collaboration.
Daki:
https://otakumode.com/shop/60d4481382757f62b61b7eda/Shirakami-Fubuki-Dakimakura-Pillow-CoverBundle:
https://otakumode.com/shop/60d4481482757f62b61b7edf/Shirakami-Fubuki-Goods-SetA friend of mine guesses it's made of 2 Way Tricot from the info that it's 100% polyester and from Japan, can't say for sure tho.
It's one-sided art, which is a huge turnoff, but the art is pretty wholesome, which I personally like.