Register within the month of August and take the test between now and March. Depending on the test, you'll get the relevant textbook. (SSCP, CAP, CSSLP, CISSP, CISSP-ISSAP, CISSP-ISSMP) Just enter the promotional code
TEXTBOOK when checking out at Pearson Vue.
http://education.isc2.org/cbt-offer/
On a side note... I'm taking the CISSP CBT tomorrow! I registered in early July so no free textbook for me but hopefully I won't need it. My main sources of material were some Shon Harris audio tapes, some of the chapters in her book, study groups, and several practice tests. (Or quizzes)
One of my greatest worries is the length of the test. I have a hard time focusing for long periods of time. I tend to take every last minute given to me when taking exams. I took the SSCP exam last year and felt very confident after taking the test but I had only minutes left before the test ended. (I passed) I tend to re-read questions 2 to 3 times. My two weakest domains are Security Architecture and Design and Software Development Security though I've been pushing them hard for the last two weeks.
Overall I feel ready so I guess come tomorrow night we'll find out.