Update: these sites appear to have been taken down.
Neither these web sites nor their owners are affiliated in any way with or endorsed by ISACA. Nor have these web sites or their owners been authorized as registrars for the CISA exam or as distributors of any CISA study materials.
Any registration for the CISA exam or study aid purchase made through http://www.cisaca.org or http://www.cisaca.com, is NOT valid. ISACA is not responsible for any refund of registration fees or study materials purchased through these sites. The only legitimate online exam registration and study aid purchase web site is http://www.isaca.org.
Anyone that has been deceived by these web sites, is asked to please contact ISACA International Headquarters’ certification department (certification (at-sign) isaca (dot) org) and provide the following information, their name, email address, who the payment was made to, the amount paid, the exam registered for, and the web site accessed to register for the exam. We highly encourage you to contact the ISACA certification department regarding registration for future CISA exams.
Original posting from www.isaca.org