OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The crest jewel of wisdom (Vivekachudamani) ; and the Awakening to the self (Atma Bodha) of Sankara by Śaṅkarācārya. ISBN 1897853696. Published by Llanerch in 1994. Publication and catalogue information, links to buy online and reader comments.