This is a book that is no longer in print so once it is gone it's gone.
It was originally published in 2017.
It has been written for D&D 5th edition and can be dropped into the middle of a game or you can just jump into the world and explore.
Description from the publisher
Critical Role has taken the roleplaying world by storm. Now, you can join the adventure! Until now, the wondrous and dangerous lands of Tal’Dorei have been the sole stomping grounds of the show’s adventuring company, Vox Machina. But now, you can explore these realms in a tome from the pen of Game Master Matt Mercer himself!
Will you find one of the revered Vestiges of Divergence or perhaps discover part of the Chroma Conclave's legacy?
Can you help the Ashari in their sacred charge to prevent the elemental vortices from overwhelming the world, or will you find yourself embroiled in the machinations of the Clasp?
This setting book takes an in-depth look at the history, people, and places of Tal’Dorei, and includes new backgrounds, magic items, and monsters for the Fifth Edition rules.