OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Ibn Qayyim al-Jawzīya on the invocation of God : Al-Wabil al-Sayyib by Muḥammad ibn Abī Bakr Ibn Qayyim al-Jawzīyah. ISBN 0946621780. Published by Islamic Texts in 1999. Publication and catalogue information, links to buy online and reader comments.