ACN is being distributed via download as a five megabyte ZIPped archive of 17 PDF and two DDL files. The "hardcopy" is a CDROM; there is no paper version offered. The ReadMe file lists the 18 other files that make up the suite and provides links to the human-readable PDFs, as well as giving acknowledgements and stating legal notices.
ACN is available on The ESTA Foundation website (see below). ESTA member discounts are available, and sales help support The ESTA Foundation's charitable and educational work.
(Jim Evans)