We picked up THIS BOOK for $40 at the Strand. They still have several copies.
It may not the great resource for posing, but in terms of physiology and just pure art it's extremely worthwhile.
We were mainly interested in the scientific value of the illustrations. Body parts drawn to perfection.
Forgetting the medical value, the aesthetic worth alone is triple the price tag.
J. M. Borgery & N. H. Jacob's "Atlas of Human Anatomy and Surgery" was originally published in this form in the 1850's with some plates published as early as 1831.
This edition by Taschen is about 16 inches x 11 inches and 500 plus pages with color plates on nearly every page. A worthwhile investment for anyone serious about drawing.