Up until a few years ago most dive agencies required a number of dives to be made as part of the nitrox certification course. This is no longer the case and for good reason. The physical aspects of nitrox diving are not any different than diving on air. The differences are in dive planning and are mostly related to understanding oxygen & depth limits. The requirements for certification are completion of an academic course (one that is very well suited to online eLearning) and completion of a short practical session. During the practical session the instructor ensures that you know how to plan your dives, use your computer (if you have one, if not dives can be made using nitrox tables) and guides you through analyzing tanks containing various nitrox blends.
The Special “club” Deal: BBD $200 for online training course, practical session, Nitrox Diver certification and certification card from the (NASE) National Academy of Scuba Educators. (See link below) http://www.naseworldwide.org/index.da