You will get your book. (Patreon)

The latest we hear is that Amazon does have The Wanderer’s Hávamál. It might take ~48 hours but the book will show as available again and orders and preorders will ship then. It does not look like there is any reason to cancel a standing order and buy it elsewhere if you already ordered on Amazon (in fact, demand is pretty heavy so doing that poses a risk of depleting the stock at other sellers).