Although you can find some good deals online, don't forget to support your local dive shop - the guys that don't make a whole lot of money, but still manage to line up dive trips to take you to Florida, the Caribbean, and other tropical destinations. Plus, they provide you with the education and training you need to not only become certified, but also to stay alive underwater. If you don't support the dive shops, they'll be forced to close. The extra few bucks it costs you might be worth it in the long run.
TreyRandom - "Divemaster Spock"
PADI Rescue Diver / Medic First Aid
PADI Equipment Specialist
Divemaster-In-Training