We go every year and I like my kiddos to have a different looking autograph book. It's really a nice keepsake and souvenir for them. I bought a dozen blank design your own journals from Oriental Trading for about $1 a piece. I have then designed the covers using embroidered stickers, rub-ons, and other scrapbooking material. No pictures, but they're pretty cute if I do say so myself. My kids love them and the characters make over them. All together, I think I paid $20 for 12 books which last us 4 years.
The journals are about the same size as Disney autograph books.