P.S. I've been trying to figure out how to send books out for FREE for a long time. I had a number of really bad experiences of sending books out to teachers for free. The organization and fulfillment of this process were tough for all involved. And I've published with many different companies who were great, but it was still a bear to work out the details.
I reached out to a few authors who had done this and found what I was missing: A process for getting the correct shipping information, payment for the shipping, and a drop-shipping company that would fulfill all the orders without a hiccup! I'm proud to partner with Disk as the fulfillment end of this process!