I must say, the Disney Junior Encyclopedia of Animated Characters makes the best Autograph book ever! Every page is in color, it shows a picture of and gives a brief description for each character, and there's plenty of space for the Disney Characters that you meet to sign their page!
I'll admit, I got this idea off of the DisBoards, and it's been fantastic using this as our Autograph book! I bought the book from Amazon for about $16. I then took it to Staples where they tore off the binding, put on a spiral bind, laminated the front and back covers, and I had them slip in a few blank sheets of card stock for any extra characters we found that didn't have a page (all done for less than $8). Here's how it turned out:
And just look at how a page looks after it's been autographed!
Autograph books from Disney World cost $18+, and that's for a book of plain blank pages (but it does come with a pretty cover). This "encyclopedia" is so much more fun - the Characters love looking at "themselves," and will often provide extra fun interaction with it. The only 'negative' about this book is that it can get quite heavy carrying it around all day in the parks - but if you're pushing a child in the stroller, toss it in the stroller bag!
Hint: You can also make your own autograph book if you want to do things cheaply. Any sized book, large or small, with blank pages will do just fine. Slap on some Disney stickers and you're good to go! Characters will sign just about anything - picture frames, pillow cases, t-shirts and more. So if you're into collecting Character autographs, get creative!!
Extra Fun: Buy these Sharpie Retractable markers to make autographing a breeze for the Characters, and colorful for you!