Most off-site hotels have AAA discount, as well as AARP and other member discounts like that.
If you don't already have some sort of towing service for you and your family, it is well worth the cost and piece of mind. Kari's parent's renew it every year for them and her, and just about every year it comes in handy. We also had a bad habit of locking the keys in the truck when we first got it because the other vehicle has keyless entry on it. (that's like 40-50$ if you have to call a locksmith, and Disney can't help you if you do that on property).
We've had to use the towing services often too. And while it might take a while for them to get to you, paying 5$ a mile for every mile after the first 5 is a lot better than the 10-15$ a towing company will charge.
When you're booking up your vacation, just ask if there's any AAA discounts. Most the time, they'll just tell you how much off. Then you can decide for yourself if that's something you think is worth the investment. And I know the discount is small, but you can buy vouchers at a AAA office for the theme parks.