Participation in the Epcot Dive Quest program costs $140, all of the proceeds go to the Disney Wildlife Conservation Fund.
My Wife, 10 year old son, and myself have just returned from a trip to Epcot during which we took the opportunity to participate in this awesome program. I made our reservations about ten days in advance with no hassles at all. The entire experience is great, absolutely everything is taken care of for you, the only thing you need to bring is your C-Card and swimsuit. They provide everything else, including showers when you're done.