USA/North America:
1) Author Direct: mshapiro@undercubashood.com
Payment options:

a. PayPal: Michael Shapiro; @miguelsan2006
b. Venmo: @Michael-Shapiro-57
c. Or, by check:
Michael Shapiro
P.O. Box 95116
Seattle, WA 98145

2) AbeBooks
Spain:
Limited Hardcover, Ediciones Verbum
Paperback, Ediciones Verbum
South America and Mexico:
Ediciones Ecoval