OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
al-Nafs al-mabtūrah : hājis al-Gharb fī mujtamaʿātinā by Daryush Shayegan. ISBN 185516700X. Published by Dār al-Sāqī in 1991. Publication and catalogue information, links to buy online and reader comments.