International American Football Officials Association
Printed copies of the IAFOA Manual of Football Officiating are available through a print-on-demand service called lulu.com. The book is available with either a coil binding so that it opens easily, or a perfect binding at slightly lower cost.
Print-on-demand means that the book will be printed somewhere near your part of the world and shipped to you. This usually takes just a few days.
Lulu offers discounts if you order in bulk (e.g. on behalf of your officials association). Currently you can get a 5% discount if you order 100 or more. Lulu occasionally offers discounts for individual purchases too. Do a Google search for "Lulu discount code" and see if you can find a valid code. Lulu no longer seem to post their discount codes on their own website.
The current MOFO can be ordered:
The book is available at the cost Lulu charge to print and ship. Note that neither IFAF nor IAFOA nor any individual receive any income from this sale.
If you simply want a PDF copy of the manual, that can be downloaded from here.