I've been searching and I don't believe this is available on Verbum/Logos. But I wanted to make this post and make sure no one else has found it hidden in a collection somewhere. I've heard good things about it.
Though republished in 2007, it has only been offered by the publisher, CUA Press, in ebook format since September, 2020.
Vote for it to be added to the Verbum catalogue here.
