You can order my books from many sources.  Look below to see which is best for you.

e77mon Storefront on Amazon - a few books (some out of print) available directly from me.

Origami USA - The Source

Nicolas Terry - France and Europe

Israeli Origami Center - Paul Jackson and Miri Golan

Dover Publications

AK Peters - “Origami Polyhedra Design” publisher

Origami books in India