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Or you can take this AOW thing piece wise, using the SSI model. I think PADI might allow this as well, where you take individual specialty course - ie night, deep, navigation, search recovery - and once you accomplished a minimum number, 5 or so, they'll grant you an AOW card.
This is the route my wife and I took. It costs more than a packaged course where they may combine the dives but we felt it was worth it. We started right after we received our OW and took the individual classes at intervals between our own personal diving. We felt it merely a way to grow in our diving skills with some mentor/friends and get our AOW in the process.