Where is a good place to order the book?
It's in wide circulation. As the old Madison Avenue tagline goes, you can find is anywhere that quality new books are sold.
Amazon.com has it; almost anytime I look up any book about guns, it comes up in the "Buyers who bought this book also bought..." section, even though I already bought it from them.
My local Borders seemingly always has at least one copy in stock. All my local gun stores have it. You will NOT have trouble finding it.