Here's an excellent reason to join ISSA assuming you are not already enjoying the benefits of belonging to this friendly, supportive and global community of information security professionals, most of whom are CISSPs. ISSA members can buy Auerbach/CRC Press books at half price, direct from the publisher and with free international shipping. For details, login to ISSA Connect and read message 3708.
Many of the best information security books in my library are published either by Auerbach or Wiley. I'm particularly fond of Managing an Information Security and Privacy Awareness and Training Program by Rebecca Herold, and Information Security Management Metrics by Krag Brotby, and have recommended them both even at full price. With 50% off and free shipping, they're a steal.