Yoshida's Dilemma is now available through publisher inknbeans Press here. It can also be found on Amazon US here and Amazon UK here
It is also available through Amazon France, Amazon Germany,  Amazon Canada and Amazon China, among others. 
Amazon Japan is selling the book here and Amazon India here
If Amazon is not your webstore of choice, other web-based outlets stocking the book online include:
Alibris here
Abe Books
Books-A-Million here
and Book Depository
In Australia/New Zealand Booktopia is listing the book here and Fishpond here