here is a few that I really enjoyed. If you like tips, you should really consider buying the book. It was less than $10 I think.
The Extra Bun Trick
Buy a double cheeseburger and request an extra bun. The extra bun will cost about $.70, but you can take one hamburger patty off and have a second burger for only $.70
Don't buy the hats/props in the store. Just try them on and have someone in your party take your picture with them. Then kindly, neatly return them to the shelf and you have a "cheap" souvenier. I'm the rules freak, I would have never thought about trying it on and taking a picture without buying it. But how many times do you really wear that goofy hat once you get home.
the book has been a great refresher and sparker of new tips for my trips. I can't wait till December to try some of them out.
If you try to do Disney more than you should like me, every dime makes it easier and "Disney on a Dime" is a great book for me.