The 'Budget' board seems to have some good tips, but I think it depends where you want to economize. If you have many people going for instance, you may want to rent a house in Kissimee (sp?)
Some people brings snacks, their own bottled water (etc.), but I try to save on the big-ticket items and enjoy the rest of my trip.
So far I've been able to economize by:
Using airmiles for my flights (Air Canada is having a discount on Aeroplan tickets right now).
Booking the Hard Rock Hotel at an Entertainment Rate of $135 (pool-view) instead of $229 to $269 a night or more. A note here: My entertainment book did not list half the hotels that the website did. You can always book an entertainment rate (when available) and then worry about getting a card. If you don't want to buy a book (still available on-line) you might be able to borrow a card from a friend. After all, you only need it at check-in.
Buying Universal Orlando passes online on the official Universal Orlando site, 5 consecutive days for the price of 2.
I wish I had a CAA card though, the shops & restaurants at Universal, Islands of Adventure and City Walk give you a 10% discount when you show your card.
Let me know if you come across any good deals!
Cheers,
Michelle