1. A Siddur with a Pirush and Psakim of Maran Rav Chaim Kanyevsky שליט"א, was recently published. It is currently available only in Nusach Ashkenaz.
The publisher is a nephew of Maran Harav Chaim Kanyevsky שליט"א, Harav Lipa Yisroelson שליט"א.
2- The Sefer `Emes V'emunah` has been out of print for a while. This book is a collection of Torah Gems from the Heilige Rebbe of Kotzk, זיע"א.
It has been recently reprinted and is available for purchase