All books and e-books are available online via Barnes & Noble and Amazon, as well as many other outlets. All books can be ordered directly through any local bookshop including all Barnes & Noble stores throughout the USA.
International Options E-book, Paperback and hardcover editions of all four books (HNPP, HOHF, PGHOHF, CCDH) are available throughout the world via Books Depository, Fishpond AU, and !ndigo CA, as well as Amazon-CA, Amazon-UK, Amazon-France, Amazon-Italy, Amazon-Germany, Amazon-Spain, etc.