In Denmark we have a huge Book Sale every year where one can save up to 90% on books.
I have bought a bunch today, and among them I have a book called "Erotique" and it is a compilation of erotic photography from 1850 up to now.
I got it for 69 DKR (approx. $14, £6). Format is approx. 5x7 inches. 224 pages.