OMG, you would not believe how many stickers I had to deal with living with my ex. They are notorious for handing them out on the parade route. Every area keeps rolls on hand of the mickey. The one with the full mickey body alternating with the mickey head sticker.
They also give out at least a dozen to the kids getting a hair cut at the barber shop. It's so funny to see the little ones sitting in the chair covered in stickers to keep them occupied. Most the time they have this look of confusion as the pull off one by one, like how did my day get so good?
The character ones, like Goofy, or Snow White with the dwarfs in a circle around, Cinderella, Einsteins, Play House Disney, Aurora, Belle, and such are given out by the character attendants. Very rarely do you find other cast members with these.
The full body Mickey, on the red background with a black ring are usually used in the gift shops and stores to seal up the boxes. They might give you a few of these, but I wouldn't expect a lot of them. They are slightly larger than the others.
If you would like to have a few spare autographs, you can either ask at Guest Relations or a Character Attendant to have the books signed when there's time. Leave the books with them, and then maybe in a couple of hours, come back for them. But it's key to find a very good attendant that's willing to help with the request. It's not so much fun for characters to be handed a stack of books (although it does happen with large groups). Then when you do meet the characters, just ask them for a solo shot (the photopass photographer can not do this for you). When you get back home, just match the picture up with the autograph. 5 books would be the maximum I would hand a character, have all books open and ready to the page you want signed stacked on top of each other. Clickable Sharpies are the best.