My 9 year old has been living and breathing these for last month and only now needs 50 stickers to to complete the book. We have over 300 stickers to swap so if you also have a son (or daughter, or even yourself!) who is looking to complete their book send me a PM with your email address and I'll send you our list.
All completed now, he swapped another 30 yesterday and we bought the remaining stickers off Panini's website.