Discorrelated Images is now available from Duke University Press, and during the Fall Sale from now until November 23, you can get it (and any in-stock Duke UP book) for 50% off with code FALL2020 if you order directly from the press: https://www.dukeupress.edu/discorrelated-images
With the discount, the book costs just under $13!
If you’re in Europe or the UK, the code also works if you order from distributor Combined Academic Publishers, which will save you on shipping and get the book into your hands quicker!