Indeed, it seems to be hard to get outside Europe. The irony is in the fact that you can't buy it in dedicated office stores but in the food supermarket. There it is among the cheapest and, for pen and ink, among the best you can get.
This one is the loose sheet 80 gsm paper which is OK-ish, but not great any more. Somewhen during 2023 the composition was changed. If you are lucky and can get one of the old batches, it will be excellent paper. The new is below average.
Something similar happened with the formerly excellent Staufen Post, which is now in the range of toilet paper. 👎
Another one is the also discontinued Neusiedler Japan Post 80 gsm, which was available until about 2-3 years ago, but is discontinued as well. 😪 If you find some NOS, buy immediately.
This one is the good Kyome (the link points to the blanc, it is also available lined or with square grid).
The Brunnen letter pad is another very good paper.
If you can live with heavy paper in the range of 90 to 100 gsm, the already mentioned Gohrsmühle paper in loose leafs (Amazon) or Fritz Schimpf letter pad are a strong recommendation. The 80 gsm Rhodia paper is a good choice, but is in its quality a tiny bit below Gohrmühle and Fritz Schimpf.
Surprise of 2024 is the Faber Colori pad 70 gsm, which is darn cheap and has surprisingly good compatibility with pen and ink. It makes a bit thinner ink lines (ink repellent?) but is a shading master, similar to the 70 gsm Kyome!