If one really must purchase a copy of that book and if one can only think of one place of looking on the World Wide Web, then one will just have to pay the prices being asked for the "wares" that one desires. The alternative is to do an internet search and find a cheaper copy from an alternative source.
He was in touch with a guy who had a few dozen copies of the second run of the book. McCollum included an e-mail to contact the guy in the video description.
I sent an e-mail to the guy. The guy told me he had sold out of the second run, but was looking for printers for another run. He told me he would keep my information on file and let me know when he started the next run of the book. I have not heard from him.