OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Ulysses, 'Ithaca' & 'Penelope' : a facsimile of manuscripts & typescripts for episodes 17 & 18 by James Joyce. ISBN 0824028260. Published by Garland in 1977. Publication and catalogue information, links to buy online and reader comments.