CISSP exam prices going up to USD 699 / EUR 650 / GBP 560 on October 1st 2017.
Exams paid for prior to October 1st will be at the old price ($599), even if your exam date is months in the future.
Fee Schedule:
Rescheduling Exam: 50USD/35£/40€
Cancelling Exam: 100USD/70£/80€
https://www.isc2.org/-/media/ISC2/Exam-Pricing/2017-Examination-Pricing.ashx