This book may be bought at the places below.
JPL Books
https://www.jplbooks.com/collections/jews-for-jesus/products/christ-in-the-old-testament?variant=18504247509054
https://www.jplbooks.com
Amazon
https://www.amazon.com/Christ-Old-Testament-pamphlet-Illustrations/dp/1596361697
https://www.amazon.com
christianbook.com
https://www.christianbook.com/christ-in-the-old-testament-ebook/9781628620931/pd/82611EB
https://www.christianbook.com